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Analysts & Consultants

Raghu Das

Raghu Das - CEO

+44 (0)1223 812300
Raghu Das MA (Cantab) is CEO of IDTechEx. He has a MA Natural Sciences degree from Cambridge University, where he studied physics. He has been closely involved with the development of printed electronics for ten years, carrying out consultancy in Europe, USA, Asia and the Middle East. He has lectured as an expert at over 300 events and conferences around the world and is author of several IDTechEx publications. He leads IDTechEx consulting effort and research programs. His analyses of the industry and market forecasts have been cited globally, in publications such as Wall Street Journal and the Financial Times.
-University of Cambridge, Masters Degree, Natural Sciences (Physics)
-Has grown the company to a world-leading concern, making profits each year
-Knowledge bridges technical and commercial domains, helping companies successfully exploit state-of-the-art technology
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Dr Peter Harrop

Dr Peter Harrop - Chairman

+44 (0)7850 258317
Dr Peter Harrop PhD, FIEE is Chairman of IDTechEx Ltd. He was previously Director of Technology of Plessey Capacitors Scotland and Chief Executive of Mars Electronics, a start-up he took to $260 million gross sales value with highly automated factories built in US and UK, without acquisitions. He was a board member of $1.5 bn Mars UK, a division of Mars Inc. Mars Electronics was sold for $500 million after he left, generating an excellent return.
He has been Chairman of 15 high tech companies over a period of years including turnrounds on behalf of venture capitalists such as Computer Security International. The largest was Pinacl plc in Wales, made profitable and grown to $100 million in fiber optic manufacture and multimillion dollar structural networks.
Peter lectures and consults internationally on electric vehicles, energy storage, RFID and printed/organic electronics. He writes a minimum of five openly published techno-marketing reports yearly at IDTechEx.
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Dr Khasha Ghaffarzadeh

Dr Khasha Ghaffarzadeh - Head of Consulting

+44 (0)1223 812300
Dr Khasha Ghaffarzadeh obtained his PhD and MPhil from the University College London and the University of Cambridge, respectively. At IDTechEx, Khasha advises major multi-billion dollar corporations around the globe on their growth and technology strategy in the field of emerging technologies. Khasha helps clients find growth opportunities, to position products, to find partners, and to develop go-to-market strategies. Khasha has specific technical expertise in graphene and carbon nanotubes, transistors, functional inks, photovoltaics, piezoelectric and piezoresistive materials, flexible and organic sensors, transparent conductive films, and solid-state lighting. Khasha has helped clients in the USA, Japan, Germany, UK, Netherlands, Norway, France, etc Khasha has also helped develop the Market Intelligence Portal and heads up its sales and content creation process.
Market Research Reports
  • Conductive Ink Markets 2012-2018: Forecasts, Technologies, Players
  • Graphene: Analysis of Technology, Markets and Players
  • Organic Photovoltaics: Technologies, Markets & Players
  • Metal Oxide TFT Backplanes for Displays: Analysis, Trends, Forecasts
  • Transparent Conductive Films (TCF): Forecasts, Technologies, Players
Recent consultancy project examples:
  • (silver nanoparticles and other conductive inks) A $12 billion chemical company had developed a nanoparticle production technique and wanted to commercialise it. We helped them evaluate the market potential for their production technique. More specifically, we benchmarked their technology against all competitive manufacturing techniques; developed a detailed global competitive landscape; identified, assessed and quantified potential target markets across different verticals; and recommended a commercialisation strategy
  • (diversification from printing) A $600 million multi-national printing company was looking to participate in the printed electronics industry. Their existing markets had become flat or were in decline, and they were looking to diversify into emerging high-growth markets. We outlined the business landscape; identified opportunities and risks in a range of emerging market segments, systematically located a gap in the value chain, and recommended a business model taking into account their expertise, customer base, size and risk appetite
  • (printed electronics) A $7billion global chemical company wanted to participate in the printed electronics space. They were looking to invest in high-growth technologies applicable to the broadest possible range of market segments. We identified technologies that would be common across applications such as solid-state lighting, touch screens, photovoltaics, displays, components, etc. We estimated the market pull and growth potential for each technology in each application and weighted our analysis by our estimate of total application market size. Our systematic study identified top three technologies for investment.
  • (graphene and carbon nanotubes) A $7billion company wanted to bring in an emerging material into their family of technologies by acquiring a start-up. We helped them understand the competitive landscape and to systematically identify companies that offered the best fit to their existing product portfolio and future growth strategy. We identified and assessed a broad range of target companies across the globe. In our due diligence, we accounted for parameters such as IP position, manufacturing cost, scalability, product quality, funding sources, and accessible target
PhD in Electronic Engineering: London Centre for Nanotechnology, University College London
Thesis: Transport and Instability Mechanisms in Oxide Semiconductor Thin Film Transistors
Key research collaborators: Samsung Institute of Advanced Technology, Phillips Research, Holst Centre, University of Waterloo
Key experimental technical knowledge:
  • Manufacturing thin film transistors including design, deposition, patterning and etching
  • Optical, electrical and physical characterisation of thin film layers and nanomaterials
  • Full electrical and optical device characterisation
  • Experiment design
MPhil in Micro-Nanotechnology Enterprise: University of Cambridge
Thesis: Micro strain sensors using resonant MEMS devices
Key experimental technical knowledge:
  • Designing complex electro-mechanical resonant MEMS systems
  • Working with foundries to manufacture MEMS systems according to design
  • Designing and implementing complex electronic drive and read-out circuitry
  • Characterisation strain sensors under resonant conditions
  • Experiment design
BEng in Electronic and Electrical Engineering, University of Exeter
Thesis: Microcontroller pogromming for manipulating a robot arm in 2D space
Key experimental technical knowledge:
  • Micro-controller set-up and programming
  • Matlab programming including complex control procedures and user control interface
  • Various digital and analogue circuit designs and implementations
Academic Publications
1. K. Ghaffarzadeh (first author) et al. "Instability in threshold voltage and subthreshold behavior in Hf-In-Zn-O thin film transistors induced by bias-and light-stress", Applied Physics Letters (2010)
2. K. Ghaffarzadeh (first author) et al. "Persistent photoconductivity in Hf-In-Zn-O thin film transistors", Applied Physics Letters (2010)
3. K. Ghaffarzadeh (second author) et al. "Trap-limited and percolation conduction mechanisms in amorphous oxide semiconductor thin film transistors", Applied Physics Letters (2011)
4. K. Ghaffarzadeh (second author) et al. "non-ohmic contact resistance and field-effect mobility in nanocrystalline silicon thin film transistors", Applied Physics Letters (2008)
5. K. Ghaffarzadeh (fourth author) et al., "Temperature dependent electron transport in amorphous oxide semiconductor thin film transistors", Electron Device Meeting (IEDM) (2011)
6. K. Ghaffarzadeh (first author) et al., "Light-bias induced instability and persistent photoconductivity in In-Zn-O/Ga-In-Zn-O thin film transistors", SID Symposium Digest of Technical Papers (2012)
7. K. Ghaffarzadeh (fifth author) et al., "Graphene oxide gate dielectric for graphene-based monolithic field effect transistors", Applied Physics Letters (2013)
Khasha has lectured at leading academic and business conferences around the world including the USA, Germany, UK, Portugal, Greece, Spain, Japan, and China
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Dr Harry Zervos

Dr Harry Zervos - Senior Technology Analyst

+1 617 577 7890 xt 204
Harry Zervos is a Senior Technology Analyst at IDTechEx. Harry received his degree in physics from the University of Athens, Greece, and went on to study materials science at Cranfield University, where he received his PhD on the topic of precision manufacturing of optics. He is currently involved with in-depth analysis of the technologies and markets for printed electronics (with a specific interest in thin film solar and displays & lighting technologies) and leads the research effort on energy harvesting and storage technologies, looking into a variety of verticals, ranging from portable applications all the way to vehicle integration as well as large-scale implementations.
Market Research Reports
He's the author or co-author of several IDTechEx reports including:
  • New Opportunities for Gold
  • Barrier Films for Flexible Electronics
  • Conductive Inks Markets
  • Dye Sensitized Solar Cells
  • Organic Photovoltaics
  • Thermoelectric Energy Harvesting
Dr Zervos has been in charge of the topics of barrier films for flexible electronics, thin film photovoltaic technologies and thermoelectric energy harvesting for several years within IDTechEx, allowing him to gain insight in both market consideration but also deeper technology and scientific aspects, aided by his wide scientific background and understanding of science and technology principles. This is reflected in the contents of the reports he authors, which balance market insight with scientific and technical considerations, aided by his solid background in the sciences.
Having been with IDTechEx for over 6 years, he understands the company methodology for producing reports that is based on direct interviews. Dr Zervos has become versed in acquiring information on companies relating to their technology roadmaps, investment in specific emerging technologies, challenges and successes in overcoming technology hurdles etc. All this information allows Dr Zervos to construct accurate profiles of interviewed companies, based on the state of their technology development, their intended commercialization roadmap, competitive landscape etc.
Consultancy Projects
Examples of recent consultancy projects include:
  • Utilizing his knowledge on photovoltaics technologies, Dr Zervos has delivered bespoke projects to a European Government Entity that was looking to identify potential target companies to fund in the space of organic photovoltaics; as well as a major automotive OEM that was looking to integrate thin film photovoltaic technologies in its vehicles. For these projects, as well as for all other major consultancy projects Dr Zervos has been involved in, he has utilized his extensive network of personal contacts in the industries he follows, which is difficult to duplicate.
  • An overview of the competitive landscape for thermoelectric materials as well as their forecasted growth segments for a $9 Billion materials company. Dr Zervos was particularly praised by the client for his ability to navigate through topics relating both to market and business development aspects but also technology aspects that required an indepth understanding of thermoelectric scientific principles.
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» Dr Harry Zervos's Blog
Mr Franco Gonzalez

Mr Franco Gonzalez - Technology Analyst

+44 (0)1223 812300
Franco Gonzalez is a technology analyst with IDTechEx. Franco obtained an MPhil in Engineering for Sustainable Development from the University of Cambridge, where he focused on Sustainable Energy Systems. He has a honors degree in Chemical Engineering from National Autonomous University of Mexico. Before joining IDTechEx, Franco had 3 years of experience in global market analysis, strategic industrial relations, low carbon projects and initiatives. He has been actively involved in energy policy research groups in Latin-American and the UK. Since 2010, Franco has focused in the clean technology sector and its industry from a global perspective.
At IDTechEx, he is mainly involved with analysis and research of the supercapacitor, electric vehicles and energy storage technologies. Based on his technical background, knowledge in management of technology and innovation and his previous professional experience, Franco has lead high impact consultancy projects supporting the private sector to leverage opportunities in emerging industries and the public sector to improve their innovation programs for the support of a greener economy.
He is co-author of the following reports:
  • Supercapacitor / Ultracapacitor Strategies and Emerging Applications
  • Batteries & Supercapacitors in Consumer Electronics: Forecasts, opportunities and innovation
Examples of his recent consultancy work include:
  • A $200 million multi-national printing company is looking to participate in the energy storage industry. We outlined the business landscape pointing out where in the supply chain they would have an opportunity and explored the synergies with other emerging technologies which were out of the defined scope of the project.
  • The European Commission, as part of the Seventh Framework Program, requested IDTechEx to conduct a research on new business opportunities with high innovation potential in the Low Carbon Vehicle industry for Small and Medium Enterprises (SME). The resulting research will include opportunities in land, sea and air vehicles and opportunities for integration with smart mobility and smart cities and will be the base for building innovation networks for SME in Europe to bring innovations to the market.(
  • A $200 million multi-national printing company is looking to participate in the energy storage industry. Following previous consultancy projects for this company we assisted the company in engaging with potential partners in the industry. We selected a set of partners with a global distribution, engaged with them on behalf of our client and established and followed up stages for the partnerships collaborations. We will assist the company to validate the forecast volumes which the company will use to make their investment decision.
Franco has lectured in forums in Europe and the USA.
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» Mr Franco Gonzalez's Blog
Dr Jon Harrop

Dr Jon Harrop - Director

+44 (0)7970 027 695
Jon is a Director of IDTechEx, providing analysis on emerging technologies. He graduated with a Physics degree from the University of Cambridge, followed by conducting his PhD in Chemistry there. Jon has specialized in the use of technical computing in science, engineering and finance, becoming a recognized global authority on F#, OCaml and Mathematica. He has worked for leading Bluechip companies including Microsoft, BP and Aviva, developing solutions that have enabled the companies to cut development costs and get to market more quickly. He has authored four books on technical computing, and presented at events globally including in Europe and North America. At IDTechEx, Jon specialises in 3D printing and emerging materials, researching and presenting on these topics.
Dr Guillaume Chansin

Dr Guillaume Chansin - Technology Analyst

+44 (0)1223 813703
Dr Guillaume Chansin is a technology analyst with IDTechEx. He is fluent in French and English and has given presentations in both languages. Before joining IDTechEx, Guillaume worked in R&D at Plastic Logic, one of the most experienced companies in the flexible and organic display industry. Guillaume received his PhD from Imperial College London. At IDTechEx, he is based in Cambridge (UK) and covers printed, organic and flexible electronics.
Engineering and nanotechnology background
Guillaume obtained a Diplôme d'Ingénieur in Physics Engineering at the Institut National des Sciences Appliquées (INSA) in Toulouse. His master's thesis was on three-dimensional fabrication with nanoimprint lithography. He went on to develop novel nanopore and nanofluidic devices at Imperial College London, where he received his PhD. Guillaume has published several research papers in leading nanotechnology journals. His research has involved multiple disciplines such as nanotechnology, optics, microfabrication, microfluidics and materials science.
G.A.T. Chansin, J. Hong, J. Dusting et al., Small 7 (19), 2736 (2011).
M. Ayub, A. Ivanov, E. Instuli, M. Cecchini, G. Chansin et al., Electrochim. Acta 55 (27) (2010).
G. A. T. Chansin, J. Hong, A. J. deMello et al., in Nanofluidics, edited by J. B. Edel and A. J. deMello (RSC Publishing, Cambridge, 2009).
J. Hong, Y. Lee, G. A. T. Chansin et al., Nanotechnology 19 (16) (2008).
G. A. T. Chansin, R. Mulero, J. Hong et al., Nano Letters 7 (9), 2901 (2007).
N. Kehagias, G. Chansin, V. Reboud et al., Microelectron. Eng. 84 (5-8), 921 (2007).
N. Kehagias, V. Reboud, G. Chansin et al., Nanotechnology 18 (17), 4 (2007).
N. Kehagias, V. Reboud, G. Chansin et al., J. Vac. Sci. Technol. B 24 (6), 3002 (2006).
Expertise in printed, organic and flexible electronics
Dr Guillaume Chansin has authored the IDTechEx report Printed and Flexible Sensors 2014-2024: Technologies, Players, Forecasts. He reviewed all the existing printed sensors (temperature, gas, piezoelectric, etc...), identified the key players, described the various technologies and compared them against conventional (non-printed) ones. He also profiled companies manufacturing sensors, including a description of their technology, business model and value proposition.
Guillaume previously worked in R&D at Plastic Logic. He has a practical understanding of the issues and challenges involved with flexible substrates and organic materials, as well as the advantages of organic thin film transistors (OTFT) in flexible active-matrix display backplanes.
Guillaume has a good knowledge of the various display technologies, their pros and cons and has hand-on experience in handling and driving flexible electrophoretic displays (e-paper). He regularly attends SID Display week, the most important conference and exhibition on display technologies.
Examples of his recent consultancy work for IDTechEx include:
  • Leading a project for a sensor manufacturer who wanted to find potential acquisition targets to expand their product portfolio. Guillaume worked closely with this client to understand their criteria and identified the potential companies matching the requirements.
  • Helping an East-Asian component supplier understand the opportunities in emerging flexible applications. This involved gathering information across the whole value chain, identifying the areas where the current technology was lacking and analysing the growth potential in the short term.
  • Helping a client learn lessons from the past and understand the challenges in printed electronics. Guillaume provided full company profiles and assessment of successful and unsuccessful companies in printed, flexible and/or large-area electronics.
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Dr Wendy Kneissl

Dr Wendy Kneissl - Senior Technology Analyst

+44 (0)1223 813703
Dr Wendy Kneissl is a physicist with a background spanning both academe and industry. Holding a PhD from the University of Cambridge, she has also undertaken research with the Max-Planck Society in Germany and at the R&D centers of Schlumberger Oilfield Services and Korean conglomerate Doosan. She has invented and commercialized a number of technologies within the energy industries. She is currently managing the research at IDTechEx on a range of emerging technologies including meta-materials and 3D printing.
Dr Kneissl has extensive experience of working in the energy field and has explored in detail energy storage technologies whilst working for Doosan Group, a Korean conglomerate which is also one of the largest power services companies in the world. These studies included an in depth analysis of supercapacitors and the opportunities for utilizing the technology for grid storage purposes including performance, costs, as well as comparisons to alternative technologies. This work also reviewed investment trends in supercapacitor manufacturers and explored investing companies where possible, with particular reference to competitor activity.
She has an extensive background covering a number of areas of physics and the material sciences.
Main areas of experience are:
  • Mathematical modelling
  • Writing and use of large computational codes
  • Theoretical and experimental multiphase fluid mechanics including non-Newtonian fluid mechanics
  • Theoretical and experimental geomechanics
  • Thermodynamics
  • Analysis of large datasets
  • Economics, with emphasis on industrial economics
  • Statistical analysis including non-parametric statistics and regression analysis
  • Materials science, with special emphasis on advanced composites and high temperature materials
  • Market analysis and forecasting
  • Technology scouting
  • R&D portfolio management
  • Stagegate application
  • Innovation management
Dr Kneissl holds a PhD in theoretical physics from the University of Cambridge, after which she took a post as a Fellow within the Max-Planck research organisation in Germany based in Garching, Munich.
Refusing an academic post at the University of Cambridge physics department, Dr Kneissl instead became a senior research scientist at a research centre of Schlumberger Oilfield Services where she authored a number of international patents relating to reservoir testing and near wellbore analysis using pulsed laser technology.
Again, refusing a distinguished (named) Fellowship at the Oxford University Engineering Department, Dr Kneissl accepted a post as Director of the Electricity Policy Forum at the University of Cambridge where she held Faculty positions both at the Judge Business School and the Faculty of Economics. Research included policy evaluation relating to stimulation of R&D within the powder industries, design and evaluation of carbon trading schemes, and market evaluation of power generation technologies. Dr Kneissl holds an advanced degree in Economics from the London School of Economics and Politics.
Through contacts made whilst in post, Dr Kneissl was headhunted by Korean conglomerate Doosan, one of the largest multinational service providers to the power industries where she held the post of Principal Analyst. In this position, Dr Kneissl managed a team of analysts who were responsible for both managing internal innovations, as well as identifying external opportunities for acquisition or investment as the company diversified its activities in the sector. In this position, Dr Kneissl produced market reports in a number of areas including renewable energy technologies, energy storage, and transmission and distribution technologies.
Dr Kneissl has authored numerous publications in refereed journals, including Nature journal, and has been an invited speaker/chair at international conferences (including keynote). She has participated in invitation only workshops of the SPE (Society of Petroleum Engineers) and the Royal Society of London. She was elected to Fellowship of the Institute of Physics at the minimum qualifying age.
Dr Kneissl has participated in various committees, including being a former UK representative of a committee of IUPAP (International Union of Pure and Applied Physics) at the UN, UK Government committees at the former DfES (Department for Education and Skills) and the DTI (Department for Trade and Industry). She has been involved as an external evaluator of content for new courses offered by the Open University and throughout her career has undertaken regular consultancy for a number of companies.
Dr Kneissl maintains a senior position at Wolfson College Cambridge where she contributes to the governance of the college and has the opportunity to lecture if desired.
Dr Kneissl is also currently an author/editor for Woodhead Publishing (a subsidiary of Elsevier) where she writes and edits technology books mainly relating to advanced composite materials. She is currently structuring, editing, and contributing to a textbook regarding the science relating to natural fibre reinforced polymer matrix composite materials.
Dr Kneissl's collaborators have included BP, Shell, E.ON, EDF, Conoco Phillips, Scottish Power, Scottish and Southern, National Grid, Ofgem, Harvard, Princeton, MiT, and Stanford.
Dr Kneissl holds the following awards:
  • Elected Senior Resident Member, Wolfson College Cambridge 2006.
  • Elected Fellow of the Institute of Physics, 2003
  • Special Meritorious Award for Engineering Innovation, Hart's E&P. 2001
  • The University of London Granville Prize for Physics
  • Medal and Prize of the Faculty of Math and Physical Sciences
  • Halley Prize for Astronomy
  • William Bragg Award for Physics
  • Jackson Lewis Scholarship for Math
  • Herschel Prize for Astronomy
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» Dr Wendy Kneissl's Blog

IDTechEx expert associates

Prof Iain McCulloch

Prof Iain McCulloch -

Iain McCulloch is Professor of Polymer Materials in the Department of Chemistry at Imperial College London. His research interests are in the design, synthesis and application of conjugated materials for optical and electronic applications. He obtained a PhD in Polymer Chemistry in 1989 at the University of Strathclyde, UK, then joined the research department of Hoechst Celanese Corp., engaged in the research of novel functional polymers for nonlinear optics, lithography and drug delivery. Before joining Imperial, he was a Research Manager at Merck Chemicals, UK from 2000 to 2007, responsible for novel solution processable organic semiconductor materials for application in organic field effect transistors and photovoltaic devices. He has edited one book, is co-inventor on over 50 patents, and co-author of over 120 papers and four book chapters.
He is currently the guest editor for organic electronics special editions of Advanced Materials, and has recently been the guest editor for special editions of both the Materials Research Society Bulletin and Journal of Display Technology. He is an associate editor of Materials Science and Engineering Reports and serves on review panels for the UK government, is a Technology Strategy Board Monitoring Officer, is on the scientific advisory committee of several government funded projects and sits on review panels for the TSB and EPSRC. He is a co-founder and Director of Flexink Ltd, a specialty semiconductor materials start-up company and is a founding partner in the technology consultancy, C-Change LLP.
As the Research Manager of the Organic Electronics group at Merck Chemicals, he was the technical expert responsible for due diligence during the acquisitions of both the Avecia Electronic Materials group (including Covion) and the Schott Organic Lighting group.
Dr Norman Bardsley

Dr Norman Bardsley -

Dr Norman Bardsley received an M.A. in mathematics from Cambridge University and a Ph.D. in theoretical physics from the University of Manchester in England. He has been an educator, advisor, consultant, and program manager for many academic, industrial and government organizations. In 2007, he was awarded an Honorary Professorship at the University of Dundee.
Dr Bardsley advises industry, government and academia on flat panel displays, solid-state lighting and energy efficiency, with special emphasis on diffuse lighting, organic electronics and smart lighting networks.
Norman's current activities are focused upon diffuse lighting applications of OLEDs and LEDs, flexible substrates and printed electronics.
Dr John B. Fenn, Jr.

Dr John B. Fenn, Jr. -

Dr John B. Fenn Jr., is an internationally known thin film vacuum coating expert. Fenn`s expertise is roll-to-roll sputtering high-performing thin films onto flexible substrates. He has started two companies that specialized in R2R vacuum sputtering, working in such areas as transparent conductive films, high vapor barrier layers and optical layers.
Dr Fenn received a Ph.D. in Physical Chemistry from Purdue University in 1972 and then worked as a post-doctoral fellow in the Chemistry Department at UCLA. His B.S. degree in Chemistry is from Tufts University. He has published or presented over 25 papers on a variety of both converting and business marketing topics. Since 2003 he has been consulting in the area of transparent conductive films, high vapor barrier coatings, photovoltaic materials and nano particles.
Dr Gerry Boast

Dr Gerry Boast -

Dr Gerard Boast has been involved in the research and development of electric motors and drives for over 25 years. He has a B.Sc in electrical engineering and a PhD. in advanced motor control from the University of Sussex, UK.
Dr Boast provides strategic and design consultancy to the automotive and automation industries in the field of electric motor and drive systems. He has held senior positions in several electric power-train companies including most recently as V.P. of Engineering at Protean Electric Ltd where he was responsible for all technical development of their highly integrated hub-motor/inverter systems for electric and hybrid vehicles. He is the holder of several patents in the field of electric motors and controls.
Dr Rich Fletcher

Dr Rich Fletcher -

Dr Fletcher received his PhD in wireless sensors from MIT. He also holds two undergraduate degrees from MIT in Electrical Engineering and Physics. Dr Fletcher has 18 years research experience in RFID and wireless technologies, participating in a number of projects in industry and the military as well as academia. His current core research is on wearable sensors for physiological and environmental monitoring; energy harvesting; sensors for health screening and diagnostics; and wireless network architectures, mobile phones and distributed sensing.
Dr Fletcher is a research scientist at MIT, Massachusetts General Hospital and VA Hospital, in addition to being an instructor at Harvard Medical School and an assistant Professor at UMass Medical School.