Michael Rees

Michael A. Rees, MD, PhD

Founder, Chief Medical Officer

Dr. Rees received his medical degree from the University of Michigan, where he graduated Alpha Omega Alpha, and received his PhD in immunology from the University of Cambridge, England, where he also did his fellowship in transplantation under Professor Sir Roy Calne. Dr. Reese led the team that developed the first web-based kidney paired donation (KPD) matching program, resulting in one of America’s first computer-matched KPD transplants in November 2004. In 2006, he founded the Alliance for Paired Donation, a 501(c)(3) not-for-profit organization that now has over 80 participating transplant centers in 30 states and has produced transplants for hundreds of patients. Dr. Rees is the author of The New England Journal of Medicine paper that has transformed kidney paired donation into pay-it-forward, nonsimultaneous, altruistic donor-initiated chains instead of traditional two-way “swaps,” and his work has been highly publicized in national news programs and print media.

Alvin Roth

Alvin Roth, PhD

Co-founder & Chief Economist

Dr. Roth is the Craig and Susan McCaw Professor of Economics at Stanford University and the Gund Professor of Economics and business administration emeritus at Harvard University. Having made significant contributions to the fields of game theory, market design, and experimental economics, he is known for his emphasis on applying economic theory to solutions for "real world" problems, including kidney exchange. In 2012, he won the Nobel Memorial Prize in Economic Sciences jointly with Lloyd Shapley "for the theory of stable allocations and the practice of market design."

Gabriel Holschneider

Gabriel Holschneider

Co-founder, Chairman of the Board

With a strong trajectory in Latin American insurance and reinsurance markets, Gabriel has proven that there is a broad opportunity for global programs to find innovative, transparent, and efficient risk-transfer solutions. Prior to founding Rainmaker Group, he worked as a legal and financial consultant on private equity, commercial arbitration, and international transactions, designing corporate structures. He serves as a member of the boards of directors of insurance- and reinsurance-related entities in Latin America and sits on the boards of several charities and philanthropic organizations. Gabriel obtained his law degree after attending the Universidad Iberoamericana. He is a member of the continuing education programs in business and strategy at MIT and Harvard.

Susan Rees

Susan Rees, RN, BSN

Co-founder & Chief Operations Officer

Mrs. Rees has 17 years of extensive experience with the transplant community in renal transplantation coordination and administration. She is currently the national transplant coordinator for the Alliance for Paired Donation. As the living donor coordinator and, subsequently, as the transplant program administrator at the University of Toledo Medical Center, Mrs. Rees helped lead the program through a growth phase that more than tripled the total number of kidney transplants performed on an annual basis. Loved by patients and their families, she excels at patient and donor communication and has expertise in helping patients and potential living donors navigate the path from diagnosis to successful living-donor kidney transplantation.

Sassan Rafizadeh

Sassan Rafizadeh, MD, PhD


Dr. Rafizadeh holds a doctorate degree in molecular, cellular, and systemic physiology from the University of California at Davis (UC Davis) and is a recipient of the UC Davis Max Kleiber Research Prize for superior scholarly achievement. Dr. Rafizadeh is currently affiliated with UC Davis Department of Molecular and Cellular Cardiology. His previous research activities were at the UCLA Department of Head and Neck Surgery, the Department of Veterans Affairs (Greater Los Angeles), and the UC Davis Center for Comparative Respiratory Biology and Medicine (CCRBM). He has authored multiple publications in top-tier journals including Proceedings of the National Academy of Sciences (PNAS), the American Heart Association Journal-Circulation Research, and the Journal of American Medical Association (JAMA). In addition, Dr. Rafizadeh has helped build several successful businesses in the media and tech sectors.

Eric Velez

Eric F. Velez, MD

Director of International Affairs

Dr. Velez has been a team member since the founding of Rejuvenate Healthcare. He holds a medical degree from Facultad Mexicana de Medicina (Universidad La Salle) and a post-graduate diploma in Pharmaceutical Marketing from Instituto Tecnológico de Estudios Superiores de Monterrey (ITESM). Currently, he is finishing his MBA at EGADE Business School (ITESM). Eric oversees the development and coordination of Rejuvenate’s international network of service providers and facilities.

Tom Riley

Tom Riley

Co-founder, President & CEO

For more than 30 years, Tom has been a highly respected voice for healthcare innovation in the public and private sectors. He is well known for his expertise as an advisor to businesses, foundations, and associations. He is a recognized author, speaker, and leadership trainer and is a senior fellow of the University of California at San Francisco’s Center for the Health Professions. Mr Riley's current and previous clients include the Center for Science in the Public Interest, the American College of Physicians (California Chapters), the California Endowment, Blue Shield of California Foundation, the California HealthCare Foundation, Western Occupational and Environmental Medical Association, the California Academy of Dermatology and Dermatologic Surgery, the California Healthcare Interpreting Association, the Molina Foundation, and others.