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About Us > Leadership Team
Management
William H. Markle
Chief Executive Officer
With a 25-year career in high-tech medical devices focusing on the Critical Care marketplace, Mr. Markle has most recently been a senior member of two well-funded and successful medical device start-up companies: Tensys Medical and Masimo Corp. Bringing an emphasis on understanding and defining key customer requirements, operationally building and managing successful marketing, clinical support and direct sales teams, Mr. Markle has a strong record of both successful fund-raising and visionary leadership in multiple “customer-facing” disciplines.
David R. Markle, Ph.D.
Chief Technical Officer
Dr. Markle has 20+ years of experience developing fiber optic-based sensors for measuring blood parameters. Most recently, Dr. Markle was the chief architect of a continuous blood gas sensor capable of continuously measuring PO2, PCO2, pH and temperature in radial, femoral and umbilical arteries. Dr. Markle is a graduate of Duke University with Bachelor degrees in Civil and Biomedical Engineering and a Ph.D. in Biomedical Engineering.
Helene S. Spencer
VP Regulatory Affairs and Quality Assurance
Ms. Spencer brings over 20 years of direct medical device experience specializing in the development of strategic regulatory submissions as well as the hands-on design and implementation of quality systems in compliance with FDA and international standards. A veteran of multiple medical device start-up ventures, GluMetrics is Ms. Spencer’s sixth start-up with four of the previous companies being acquired and one becoming a public entity. Helene is active in numerous professional organizations and currently serves on the Board of Directors for the Orange County Regulatory Affairs Discussion Group (OCRA).
Thomas A. Peyser, PhD
VP Clinical Affairs
Dr. Peyser is a physicist with 25 years experience doing applied research on a wide range of scientific problems. He has spent the last 15 years working on innovative technologies for continuous glucose monitoring, including projects at industry leading diabetes companies as well as early-stage medical device companies. Dr. Peyser is a recognized expert in the development and clinical testing of continuous glucose monitoring systems. He is also the author of numerous papers and patents in the field as well as the recipient of two prestigious Federal government research awards for his previous work on fluorescent glucose sensors.
Rick Purvis
VP Research and Development
Mr. Purvis possesses more than 20 years experience
in the development of external and implantable medical products including 18 years with a leading diabetes technology manufacturer. He has extensive expertise in program management with a focus of electronics design and development and a track record of successfully leading the introduction of new products to market. Throughout his career Mr. Purvis has produced innovative medical products resulting in a number of issued patents relating to continuous glucose monitoring and drug delivery systems.
Ritchie A. Wessling, Ph.D.
Senior Scientist (Consultant)
Dr. Wessling is a recognized world authority on polymer structures and properties with an emphasis on chemical fluorescence, polymer colloids and saran technologies. Retired from a distinguished 35-year career at Dow Chemical Corporation, Dr. Wessling is currently a visiting scientist in the Organic Chemistry Department of the University of California at Santa Cruz. Dr. Wessling provides an exceptional perspective and hands-on ability to integrate the academic research environment with the practical requirements of commercial industry.
Scientific Advisor
Bakthan Singaram, B.Sc., M.Sc., Ph.D.
Professor of Chemistry, UCSC
Professor Singaram is a world-renowned expert in boron based chemistry and has many patents in this area covering both new reactions and new materials. His areas of interest and specific applications include silicon hydrides, stereospecific reactions, safer and more selective reducing reagents, organic light-emitting diodes, and glucose sensing. Dr. Singaram has been a full professor at UCSC for 13 years and has received numerous citations including the UCSC Outstanding Teaching Award. Prior to coming to UCSC in 1989, Dr. Singaram studied under and later directed the research group of Nobel laureate H. C. Brown at Purdue University.