Sergio Huerta, M.D.
Sergio Huerta, MD, FASAM, is Chief Medical Officer of BayMark Health Services OTP Division, serving the Western Region. Dr. Huerta is a board-certified specialist in Addiction Medicine with extensive expertise in opioid use disorder (OUD) treatment. As Medical Director of Recovery Services of New Mexico, rebranded as MedMark Treatment Centers,...
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Peter Kassis, M.D.
Peter B. Kassis, MD, FASAM is Chief Medical Officer of BayMark Health Services OTP Division, serving the Eastern Region. He is a board-certified addiction medicine physician and transformative healthcare leader renowned for his contributions to addiction treatment and behavioral health. Dr. Kassis is a graduate of New York Medical College...
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Philip Isherwood, M.D.
Philip D. Isherwood, M.D., FASAM serves as Medical Director for the Office-Based Opioid Treatment (OBOT) service line, providing clinical leadership across AppleGate Recovery, Middlesex Recovery, and Mahajan Therapeutics. A cofounder of AppleGate Recovery, he has played a key role in expanding access to high-quality, outpatient addiction treatment. With more than...
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Brian O’Connor, M.D.
Brian W. O’Connor, M.D., is the National Medical Director at Middlesex Recovery. Dr. O’Connor began practicing medicine in private practice in 1991, initially specializing in obstetrics and gynecology. He spent 20 years caring for patients in Melrose, Massachussets. In 2005, driven by his experience with an adult child struggling with...
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