About Us

Hyperbaric Medical Services (HMS), based in San Francisco, California, is a corporation providing patient care and consulting services in the field of hyperbaric oxygen therapy.  HMS is closely affiliated with Hyperbaric Consultants Medical Group, a team of predominantly sub-specialty trained, certified and boarded hyperbaric physicians.  With over 30 years of cumulative experience in the field of hyperbaric medicine, HMS brings a solid platform of clinical, administrative and marketing expertise to assist in building a successful hyperbaric program. 

Hyperbaric Medical Services (HMS) is committed to the delivery of the highest quality, comprehensive patient care in the fields of undersea and hyperbaric medicine and wound care.  We provide state of the art clinical services with full time physician supervision to the Bay area patient population in need. In addition we also strive to provide these services through strategic partnerships, the provision of consultative services and delivering educational opportunities.  In doing so we hope to improve access to optimal hyperbaric medical care for all at risk populations.

Our Team

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Dr. Jamie Marie Bigelow, MD, FCCP

Dr. Bigelow completed undergraduate work at Columbia University in 1985.  She then attended medical school at the University of Miami in 1990, and residency in Internal Medicine at Harvard University’s New England Deaconess Hospital in 1990-93. She completed fellowship in Pulmonary and Critical Care Medicine at UCSF in 1996. Dr. Bigelow began her private practice in Pulmonary and Critical Care Medicine at Saint Francis Medical Center in 1999 and later added Sleep Medicine in 2007.  An enthusiastic diver, Dr. Bigelow became certified in Hyperbaric Medicine in 2000 and worked with Dr. Cianci as a member of Baromedical Associates.  She became sub-specialty board certified in Undersea & Hyperbaric Medicine (ABPM) as of January 2011 and served as medical director of the Hyperbaric Department at St. Francis Memorial Hospital from 2011 through 2014.  In addition to Undersea and Hyperbaric Medicine, Dr. Bigelow is board certified in Internal Medicine, Pulmonary, Critical Care and Sleep Medicine.

Dr. Paul Cianci, MD, FACP, FUHM


Dr. Cianci brings a wealth of experience to the practice, development and management of hyperbaric oxygen/wound care facilities. He initially served as Staff of Internist U.S. Naval Hospital Oakland. Chief of Medicine Naval Hospital Guam during the Viet NamWar and later Western U.S. Diving Medical Officer for the U.S. Navy, for 18 years, retiring with the rank of Captain after 27 years of service. He is a member of the Hyperbaric Oxygen Committee of the Undersea and Hyperbaric Medical Society (since 1976) and past President of the Undersea and Hyperbaric Medical Society (UHMS) in 1991. He is Professor Emeritus, Internal Medicine, University of California, Davis, and has worked as consultant to the U.S. Navy, U.S. Air Force, Department of Defense, NOAA, and State of California. He has presented papers internationally in Asia, Europe, and the Middle East, published more than 150 articles in peer-reviewed journals, and written numerous book chapters on hyperbaric oxygen therapy and the diabetic foot, thermal burns, radiation damage, necrotizing fasciitis, fungal infections and problem wounds. Dr. Cianci was the Medical Director for the Department of Hyperbaric Medicine, Doctors Medical Center, San Pablo, Saint Francis Memorial Hospital, San Francisco, Medical CA, and John Muir Hospital, Walnut Creek and is board certified in Internal Medicine (ABIM) and sub-specialty certified in Undersea & Hyperbaric Medicine (ABPM). Dr. Cianci is responsible for the foundation and development of the three major hyperbaric centers in the Bay Area, Saint Francis Memorial Hospital, San Francisco, Doctors Medical Center, San Pablo and John Muir Hospital, Walnut Creek, in addition to the University of Texas Health Science Center, Houston where he served as head of the Dept. of Hyperbaric Medcine He also consulted in the development of centers at Community Hospital of the Monterey Peninsula, Monterey, CA, Our Lady of the Lake Regional Medical Center, Baton Rouge, LA, and Atlantic Baromedical Services, Innova Hospital System, Mount Vernon and Fairfax, VA. Dr. Cianci was awarded by UHMS the Albert R. Behnke Award for 2018 in recognition of outstanding scientific contributions to advances in the undersea or hyperbaric biomedical field.


Dr. Roger Friedenthal, MD, FACS

Dr. Friedenthal completed his undergraduate work at Stanford University “With Great Distinction” and then attended Yale University School of Medicine. He completed his internship at Yale-New Haven Medical Center and completed his residency training in General Surgery at University of California San Francisco Medical Center and Stanford Medical Center. He completed his residency training in plastic surgery at UCSF Medical Center and is a Diplomate of the American Board of Plastic Surgery. He has been Chairman of the Department of Plastic Surgery at California Pacific Medical Center, and he is a Clinical Professor of Surgery at UCSF Medical Center. He has been Chairman of the Association of the Clinical Faculty at UCSF Medical center. He has been secretary of the California Society of Plastic Surgeons and he has been a member of the Board of Directors of Brown and Toland Medical Group. He has been a member of the Board of Directors of the California Medical Association, and he has served as Chairman of the Council on Scientific Affairs for the CMA. Dr. Friedenthal is an operating room accreditation inspector for the American Association for Accreditation of Ambulatory Surgery Facilities, and he is an Expert Reviewer for the Medical Board of the State of California. Dr. Friedenthal additionally became certified in hyperbaric medicine in 2017.

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Dr. Helen Gelly, MD, FACCWS, UHM/ABPM

Dr. Gelly is board certified in Undersea & Hyperbaric Medicine (ABPM) and has been involved in hyperbaric medicine and wound care since 1991. Past positions have included Medical Directorships at academic and community hyperbaric medicine and wound care programs. She started one of the first UHMS accredited, non hospital affiliated hyperbaric centers in the country. Her company has provided hospitals with both management and transitional support. She has been actively involved in billing and reimbursement issues for both facilities and physicians. Until recently, she was the Medical Director of Hyperbaric Physicians of Georgia, a group of physicians dedicated to the practice of hyperbaric medicine and wound healing, with 5 subspecialty boarded physicians in its membership. In addition to lecturing nationally on hyperbaric medicine and wound healing for many years, she was the president of the Gulf Coast Chapter of the UHMS from 2005-2007, and currently serves on the Education Committee and co-chairs the Quality, Utilization, Authorization and Reimbursement Committee of the UHMS. Currently, she serves as the Emeritus Medical Director of Hyperbaric Physicians of Georgia, and as CEO of HyperbarRX.

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Dr. James R. Macho, MD, FACS

Dr. Macho completed his undergraduate work at Boston College with a BS in Biology. Following service in the United States Naval Reserve, he completed an MS degree in Physiology and Biophysics at Rutgers University in New Jersey. He then attended Harvard Medical School and received his MD in 1980. Dr. Macho went on to complete a residency in General Surgery at the University of California, San Francisco, serving as a Chief Resident in 1985-86. He completed a Fellowship in Critical Care Medicine in 1983-84, also at UCSF. Following residency, Dr. Macho joined the Faculty in the UCSF Department of Surgery where he served initially as a Trauma Surgeon at San Francisco General Hospital and as the Associate Director of the SFGH-Trauma Intensive Care Unit. In addition to a busy clinical practice, Dr. Macho was active in research and teaching residents and medical students while at UCSF. He is the author of multiple articles and book chapters and has lectured throughout the United States in the areas of general surgery, surgical critical care, and related topics. In recognition of his teaching abilities, Dr. Macho was elected to Alpha Omega Alpha, the Medical Honor Society, by the UCSF medical students. Dr. Macho retired from UCSF in 2000 with the academic rank of Emeritus Professor of Surgery and entered the private practice of surgery at Saint Francis Memorial Hospital. While at Saint Francis, he has served as the Director of Critical Care Medicine, Director of the Bothin Burn Center and Chief of Surgery. He is a Fellow of the American College of Surgeons (ACS). He has served as a Governor in the ACS national organization and as the President of the ACS-Northern California Chapter. In addition, Dr. Macho has served as the President of both the UCSF-Naffziger Surgical Society and the San Francisco Surgical Society. He is a Senior Member of the Pacific Coast Surgical Association. Dr. Macho is board certified in General Surgery and Surgical Critical Care. In his spare time, Dr. Macho enjoys scuba diving, photography and sailing on San Francisco Bay.

Dr. Ronald Sato, MD

Born and raised in Hawaii, “Dr. Ron” affectionately known by patients and friends, received his education at Yale Medical School and completed his plastic and reconstructive surgery training at Stanford University, later serving on Stanford’s teaching faculty.  He has lived and worked in the Bay Area for the past 40 years, practicing exclusively in burn/wound care and reconstructive surgery.  Dr. Sato is also the former Medical Director of the burn centers at Santa Clara Valley Medical Center and Doctors Medical Center in San Pablo.  His extensive wound care background, interest in technological advances in medicine, and training and experience in hyperbaric medicine allow Dr. Sato to provide many options for wound recovery. Hallmarks of Dr. Sato’s practice have always included direct communication with all of his patients 24/7, family participation, home health and skilled nursing care, if needed.  He strives to keep all patients’ providers informed of treatment and progress.


Dr. Scott Sherr, MD

Dr. Scott Sherr is a Board Certified Internal Medicine Physician with additional certification in Hyperbaric Oxygen Medicine. He graduated Summa Cum Laude and Phi Beta Kappa from UCLA with a BA in History and BS in Psychobiology. He then attended University of Maryland Medical School and Residency Program where he graduated Magna Cum Laude from the former with Alpha Omega Alpha Distinction. Dr. Sherr is a member of the Undersea and Hyperbaric Medical Society, The Institute of Functional Medicine, and the Society of Hospitalist Medicine. He is one of the few medical doctors in the country using an integrative approach to hyperbaric treatment (with targeted lab work, diet, supplementation, and additional innovative technology) to accelerate wound healing and optimize physiology.  In addition to his virtual consulting and education practice, Dr. Sherr is the Director of Integrative Hyperbaric Medicine and Health Optimization at Hyperbaric Medical Solutions in the New York area.  


Dr. Tiffany Townsend, MD

Dr. Townsend is a board-certified Anesthesiologist, Diving Medicine Physician, Advanced Wilderness & Expedition Provider, and U.S. CoastGuard Operational Auxiliarist. A California native with her undergraduate (UT Austin) and medical school (UT Southwestern, Dallas) training in Texas, she returned for residency at UCSF in 2000, transferring to anesthesiology after completing 4 years in surgery and research. Practicing at Mills-Peninsula Hospital since 2007, she joined Hyperbaric Medical Services as a Diving Medicine Consultant in 2019.

A PADI-certified SCUBA diver since 2005, she progressed to Rescue Diver, spent 5 years volunteering as an Aquarium Diver at the California Academy of Sciences, and became a Divemaster in 2017. Her creative passion is underwater photography, and she recently completed her 300th open water dive. Wishing to incorporate her love of diving with medicine, Dr. Townsend trained as a UHMS/NOAA Physician in Diving Medicine in 2014. She dove to 160 FSW on air in the hyperbaric chamber, while conducting neurological exams, and experienced surface-supplied air “hard hat” diving in the NOAA dive tower. She is Level 2D (Diving Medicine) certified by DMAC and EDTC, qualified to perform fitness to dive recreational/aquarium/commercial examinations, manage dive accidents and related illnesses, advise on diving medicine and physiology, and provide hyperbaric therapy. In 2018, Dr. Townsend’s training broadened to include Wilderness Medicine, becoming qualified to assess, stabilize, and improvise care for trauma victims in austere environments. 

Dr. Townsend volunteers on the Board of the Tiburon Yacht Club and as a U.S. Coast Guard Auxiliarist. She supports recreational boating safety as a Vessel Examiner and Boat Crew member, participating in helicopter rescue training and marine safety patrols on San Francisco and Monterey Bays.

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Ryan Gamlin, Business Development

Responsible for developing and implementing strategies that drive both profit and long-term growth, Ryan is a management consultant with substantial expertise in healthcare strategy, finance, product development, and operations. In industry, Ryan held management roles in large Managed Care and Pharma enterprises, including UnitedHealthcare, Coventry Health Care, and McKesson. As a consultant, Ryan leads strategy and operations engagements in both provider and payor environments, leveraging his experience in both contexts in his role at HMS. Ryan earned a degree in Economics from Miami University’s Farmer School of Business, and recently graduated from University of Cincinnati College of Medicine. In addition to his valuable contributions to HMS, he is presently completing his residency in Anesthesiology at UCLA.