The Team
 Richard M. Greenwald
PhD, President / Co-Founder
Richard M. Greenwald, PhD, founder and President, is an entrepreneur and biomedical engineer with over 15 years of experience in research and development in sports and orthopedic biomechanics.
Dr. Greenwald has been directly involved in product development for numerous biofeedback and data acquisition products for the medical and rehabilitation industries. He has received multiple awards from the National Institutes of Health, National Science Foundation, and Department of Defense for product development through the Small Business Innovation Program (SBIR). He co-founded iWalk, Inc. (Cambridge, MA) with Hugh Herr, PhD, to commercialize novel robotic prosthetic technologies, was CEO of iWalk from 2006-2009, and now serves on iWalk’s board. Dr. Greenwald previously started and managed the US Division: Orthopedics, Sports, and Rehabilitation, for TÜV Product Service, a multinational firm specializing in product testing and regulatory certification of products for sale in the European Union. He currently serves on the Advisory Board for the National Center for Medical Rehabilitation Research at NIH, and is President of the International Society for Skiing Safety.
He is an Associate Professor (adjunct) at Thayer School of Engineering at Dartmouth College and a Research Affiliate in the Department of Aeronautics and Astronautics at the Massachusetts Institute of Technology.
Dr. Greenwald is currently directing five federally funded research and development projects at Simbex.
 Jeffrey J. Chu
Vice President of Engineering
Jeffrey J. Chu blends a long history of applied research and product development in exercise science, sports and orthopedics to his position as Director of Engineering. His innovative algorithms based on neural networks, fuzzy logic, and advanced optimization techniques, along with a strong balance of electronic design, material selection, and software systems integration, keep the Simbex team driving toward new product solutions. Jeff has worked for sports product development companies ranging from Nike to New Balance and later Saucony, where he was responsible for developing advance concept motion control and shock attenuation technologies.
 John G. Stephens
Director of Operations
John Stephens has helped build several venture-backed firms from very early stages. As senior technical executive, he has set company direction in diverse markets including network communications, financial analysis and prosthetics.
Recently, John served as VP of Product Development for iWalk, a MIT spinoff developing robotic prosthetics. Prior to that, as CTO of Accentus, he developed a data monitoring system for the financial services industry based on the novel use of music as "aural graphing."
In 1986, John was one of 5 founders of Cayman Systems, an early innovator in cross-platform workgroup routers. As CTO, he set the technical direction of the company as it refocused on home broadband routers. In 2001, Netopia Inc. (recently purchased by Motorola) acquired Cayman. As Netopia's VP of Broadband Services, John integrated several internal development groups and acquisitions to create a family of value-added broadband services, including one licensed to the Linksys division of Cisco.
John graduated from Williams College with a degree in Economics and received an MBA from MIT's Sloan School of Management.
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