About RheoMed

We are physician founded and led. Our culture promotes collaborative learning amongst our group. Physician engagement helps drives patient engagement which drive outcomes and lower costs.

Board of Directors

Tarun Marwaha, M.D.
Chairman of the Board

Eric Wechsler, MD
CMO & Board Member

John Hsieh, M.D.
Board Member

Bruce Greenfield, M.D.
Board Member

Executive Team

Martin Serota, MD

Martin Serota, M.D. has over 20 years of experience as a leader and innovator in value-based care, both as a practicing physician and a C-suite executive. Dr. Serota has helped lead and grow several near-billion-dollar medical entities of national scale. He has a deep knowledge of clinical quality, medical management and business operations and his companies have excelled at delivering on the health care Quadruple Aim.

Abra Siegel, MBA

Abra Siegel has over 25 years of experience in healthcare and has held various senior positions.  She has lead the development of multiple IPA’s and MSO’s, as well as medical group acquisitions for Health Dimensions (now HCA), Tenet Health System and Sutter Health System.  She also has lead the negotiations and payer strategy for both institutional and professional contracting with expertise in VBC arrangements in multiple states.  While at Stanford Health Care, she lead the strategic development of various service lines in partnership with the Chairs and Chiefs of the Stanford SOM. 

Eric Wechsler, MD

Dr. Wechsler believes very strongly that kidney disease and the associated conditions of heart disease and diabetes can be prevented or slowed with early detection and treatment. His general philosophy in medicine is to educate his patients so they will be empowered to aid the doctor in treating their disease.

Steve Sawelson, MD
Medical Director of Care Coordination

Dr. Sawelson is a Board-Certified Nephrologist who has practiced Nephrology for over 30 years in Torrance, California. He has interests in all aspects of Nephrology, with a special interest in pregnancy-associated hypertension, kidney disease, pre-eclampsia, pregnancy while on dialysis, and pregnancy when a kidney transplant is present.

Management Team

Debbie Harrop, FNP
Care Management Program Director

Debbie Harrop is a Family Nurse Practitioner whose commitment to patient-centered, culturally competent care is at the core of her practice philosophy. With diverse clinical experience in acute and chronic care of complex patients with multiple comorbidities, she is passionate about health promotion, patient engagement, and upstream kidney care. She currently leads our Care Management Program and works at several nephrology practices in OC and LA counties.

Seleste Childers
Senior Operations Manager

Seleste Childers brings in over 7 years of experience fueled by a background in Revenue Cycle Management and attainment of her Certified Professional Coder License.  She was able to hone her skills previously as a Client Manager where she was entrusted with the responsibility of overseeing multiple practices and took pride in ensuring that their financials were not just managed but maximized. Here at RheoMed Seleste is responsible for many of the operational intricacies. Her role demands a strategic mindset, an unwavering attention to detail, and a profound commitment to professionalism.

Joshua Raskin
Board Advisor

Joshua Raskin, CFA is Co-Founder and Senior Research Analyst at Nephron Research LLC. Founded in 2017, Nephron is the leading independent research and consulting boutique focused on healthcare. Nephron maintains client relationships with over 150 of the world’s largest and most sophisticated healthcare investment firms in the world. At Nephron, Joshua coordinates coverage of the payors, providers and other emerging healthcare services sectors. Joshua also serves as an external advisor to several private healthcare services companies including RheoMed and Waymark Health.

Contact us today.

Company Information:

625 The City Drive, Suite 310

Orange, CA 92868


Skip to content