About the chapter

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  James F. Baur

  President (until 31 October 2026) · Member of PAC-San Diego

  James F. Baur has served as President of the San Diego Chapter on three occasions, widely separated in time. He is a Sigma Xi activist, having attended 34 of the last 37 Annual Meetings and served on at least 12 Society committees, notably for six years on the International Committee and an additional seven years as Chair of that committee. He was presented the Evan Ferguson Award for service to the Society. He has served in several Society leadership positions, including on the Board of Directors in four different capacities. He is a Sigma Xi Fellow and a Life Member.

  He earned BS, MS, and PhD degrees, all in physics. He is now president of Science Solutions Inc.

• Paul de la Houssaye

  President (from 1 November 2026) · Member of PAC-San Diego

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• Vacant

  Secretary · Member of PAC-San Diego

  This position is open. If you would like to serve, or to suggest someone, write to the chapter.

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  Stephen D. Rosen

  Treasurer · Member of PAC-San Diego

  Stephen D. Rosen is a technology entrepreneur, engineer, inventor, and longtime Sigma Xi member whose career has focused on telecommunications, advanced engineering systems, applied research, and technology commercialization. He is CEO and Co-Founder of Athelytix, Inc., developing advanced sports-performance and biomechanical measurement technologies, and is an inventor on multiple issued and pending patents.

  He holds a Bachelor of Arts in Earth Sciences from the University of California, Santa Cruz and a Master of Science in Geology from the New Mexico Institute of Mining and Technology. Stephen also serves in leadership roles with educational, scientific, and community nonprofit organizations, with a particular interest in STEM education, research, and civic engagement. He became a Life Member of Sigma Xi in 1983.

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  Susan E. Smith

  Member of PAC-San Diego

  Susan E. Smith is a retired fishery biologist (research) who worked for NOAA’s National Marine Fisheries Service (NMFS) at its Southwest Fisheries Science Center (SWFSC) laboratories for over 30 years, at the Tiburon Laboratory in Tiburon, California (1970–1990) and at the Center’s headquarters laboratory in La Jolla, California (1990–2005). She specialized mainly in the age, growth, and population biology of sharks, and in the spatial and temporal distribution of California Current euphausiids (krill). She also served as chief writer-editor and publicist for the Southwest Science Center’s four marine laboratories in California and Hawaii, and as special assistant to NMFS’ Southwest science and regional directors.

  After retiring from NOAA-NMFS in 2005, she worked on contracts for NOAA/NMFS as a private contractor with Seiurus Biological Consulting, creating a fishery management plan for the conservation of West Coast euphausiids, researching and publishing on the age and growth of the shortfin mako shark, and publishing a new method for calculating intrinsic rebound potentials across diverse shark species. She obtained a Bachelor of Fine Arts in art and visual communications from Pratt Institute in New York in 1965, then switched careers to biology, doing college and postgraduate work in the marine sciences at Monmouth University in New Jersey and at the College of Marin and San Francisco State University in California.

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  Caitlin J. Curry

  Member of PAC-San Diego

  Caitlin J. Curry is a Researcher for the Conservation Genetics group at the San Diego Zoo Wildlife Alliance, where she uses genome-scale data to support interdisciplinary approaches to wildlife management, translating complex genetic signals into actionable insights to protect vulnerable populations, especially large carnivores.

  Caitlin has a diverse background centred around wildlife and conservation. She has a Bachelor of Science in animal behavior from the University of Washington, her doctorate in conservation and population genetics from Texas A&M University, and is a certified dog trainer through the Animal Behavior College. She was a postdoctoral fellow in Conservation Genetics at Omaha’s Henry Doorly Zoo and Aquarium before joining the San Diego Zoo Wildlife Alliance team. Caitlin also serves in leadership roles with several conservation and wildlife organizations, and became a member of Sigma Xi in 2020.

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  Roger J. Greenwald

  Member of PAC-San Diego

  Roger J. Greenwald is an inventor, medical device executive, engineer, and quality consultant with 35+ years of experience leading development, manufacturing, quality systems, and regulatory remediation for diagnostics, infusion systems, and surgical devices. After a decades-long career in industry spanning R&D, product development, manufacturing, and quality assurance, Roger became a partner at NJK & Associates in 2007, where he has since served as Principal Consultant. NJK & Associates is a medical device consulting practice providing engineering, manufacturing, quality systems, and regulatory expertise to manufacturers ranging from early-stage startups to multinational organizations. Along the way, Roger earned over 50 US patents in areas including photography, surgery, dermatology, infusion, and ophthalmology. He has also served as interim executive, technical expert, engineering leader, and expert witness across more than three decades of consulting and industry leadership.

  A seasoned teacher with a hands-on leadership style, Roger helps clients understand what regulations demand and how to meet them in the most efficient way possible. His skill in problem-solving and root cause investigation has helped clients catch and resolve issues early — often before they became customer complaints or reportable events. He is widely recognized for solving technically difficult problems through structured investigation, practical engineering, and FDA-compliant quality systems. Roger earned a BS in Physics from Northeastern University and an MS in Optics from the University of Rochester’s Institute of Optics. He was inducted into Sigma Xi in 1974 based on his independent research into the behavior of electro-optic crystals.

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  Michael Weiner

  Member of PAC-San Diego

  Michael Weiner is a Core Investigator of the Health Systems Research Center for the Study of Healthcare Innovation, Implementation and Policy at the U.S. Department of Veterans Affairs, a VA physician in General Internal Medicine and Primary Care, and Health Sciences Clinical Professor in the Division of General Internal Medicine at the David Geffen School of Medicine at UCLA. His clinical and health-services research focuses on measuring and improving the quality, coordination, and delivery of health services, especially for older adults. He studies the effects of health information and information technology on behaviors, clinicians’ practices, and patients’ outcomes, and has conducted studies of specialty referral and telecommunication to improve health care. His study methods have included cohort studies, clinical trials, surveys, and focus groups.

  His current research includes the development, implementation, and study of information systems to promote clinical handoffs, management of medications, patient safety, health information exchange, clinical decision support, and artificial intelligence. His primary interest is the transformation of knowledge into useful, usable products and healthful behaviors, to improve efficiency, our connections to each other, our environments, and the quality of our lives.

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  Bobbi Baur

  Member of PAC-San Diego

  Bobbi Baur earned her BA from SDSU and completed graduate work at UCSD in Political Science. She then changed direction, going to work in the San Diego shipyards in purchasing, sales, and quality assurance. She realized that manufacturing environments were her preference and continued through stints in sheet metal and sign fabrication companies, a scientific glassblowing company, and finally at Aquaneering, where she worked for the last twenty years.

  Aquaneering designs, manufactures, and installs housing systems for aquatic animals used in medical research, and in her role as Sales Manager she travelled extensively for conferences and customer meetings, picking up some science along the way. She is proudest of, first, developing and donating “Education Housing Racks” to K-12 programs to engender a love of science at an early age by using zebrafish in the classroom and, second, organizing an annual Zebrafish Husbandry Workshop for 18 years.

  Now retired, Bobbi is excited to support Sigma Xi in its mission to enhance, foster, and promote science.

• Myra Khandelwal

  Member of PAC-San Diego

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  Bruce Hubbard, MD

  Member of PAC-San Diego

  Bruce Hubbard, MD, has been a Sigma Xi member since 1970 at the Vanderbilt Medical School Chapter. When he finished his training at UCSD School of Medicine, he sustained a full-time faculty position at that institution for three years before segueing to the private practice of psychiatry in San Diego in 1979. He is currently owner and medical director of the largest Transcranial Magnetic Stimulation (TMS) practice in the US. In addition, he recently has been a staff psychiatrist at The Indian Health Council in Rincon, California.

  His avocations include cooking, landscape photography, and messing around in a large greenhouse with orchids and aroids.

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• Saurabh Jain

  Member of PAC-San Diego

  Saurabh Jain is a chip design engineering leader with 18+ years of experience in semiconductor design and verification, focused on the high-speed interfaces behind modern consumer technology. He is a Hardware Engineer at AMD San Diego, leading verification of USB4, USB3, and PCIe, the connections that power millions of devices worldwide. He has built and led verification teams across the globe and contributed to IP design for HDMI and DisplayPort, with expertise spanning UVM-based verification, low-power-aware design, and FPGA emulation.

  He holds a B.Tech in Electronics and Communication. He joined Sigma Xi as a full member in 2025.

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Officers serve without payment. To reach one of them, see the contact page.