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Our Leaders

Our executive leadership strives to continually achieve our aim of providing better health care - and a better health care system - to every patient we serve.

Hal Teitelbaum
Hal Teitelbaum MD, JD, MBA

Managing Partner & CEO

Dr. Hal Teitelbaum is the Founder, Managing Partner and Chief Executive Officer of Crystal Run Healthcare—a premier multi-specialty group medical practice. Dr. Teitelbaum completed his training in Internal Medicine at New York Hospital-Cornell Medical Center, and in Medical Oncology and Hematology at Memorial Sloan-Kettering Cancer Center. After beginning his career in full-time academic practice, Dr. Teitelbaum established a solo practice in Orange County, New York, in 1982. He established Crystal Run Healthcare in 1996. Dr. Teitelbaum is a 1998 Honors graduate of Columbia Business School, where he earned his MBA. He earned his Juris Doctor degree from Columbia Law School, Class of 2012, where he was a Harlan Fiske Stone Scholar.

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Michelle A. Koury MD

Chief Operating Officer

Dr. Michelle A. Koury is the Chief Operating Officer at Crystal Run Healthcare. Dr. Koury is a cum laude graduate of Rutgers University and attended medical school at Tufts University School of Medicine. She completed her residency in Internal Medicine at New England Medical Center-Tufts University School of Medicine, Boston, MA. A board certified Internist, Dr. Koury joined Crystal Run Healthcare in 1996, after which she earned her certification as a medical director for long-term care – one of only two in Orange County at the time. Dr. Koury was appointed as Crystal Run Healthcare’s first Medical Director in 2002 and served in that role for six years, until being appointed Chief Operating Officer in 2008.

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Gregory A. Spencer MD, FACP

Chief Medical Officer & Chief Medical Information Officer

Dr. Gregory A. Spencer is the Chief Medical Officer and Chief Medical Information Officer at Crystal Run Healthcare. Dr. Spencer graduated from the Medical College of Wisconsin (Marquette University) Medical School and completed his residency in Internal Medicine while in the US Air Force at Wilford Hall USAF Medical Center in San Antonio, TX. Dr. Spencer joined Crystal Run as an internist in 1996 and was appointed as Chief Medical Officer and Chief Clinical Information Officer in 2008. Dr. Spencer is board certified in Internal Medicine and is a Fellow of the American College of Physicians.

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Scott Hines MD

Chief Quality Officer, Medical Director

Scott Hines, MD, is Crystal Run Healthcare’s Chief Quality Officer, Medical Director, and physician leader for Crystal Run Healthcare’s medical specialties division. Dr. Hines is board certified in Internal Medicine, Endocrinology, Diabetes and Metabolism. Dr. Hines earned his Medical Degree from the Wake Forest University in Winston-Salem, NC, and completed his residency in Internal Medicine at the Dartmouth-Hitchcock Medical Center in Lebanon, NH. Dr. Hines completed his Endocrinology Fellowship at the University of Maryland Medical Center in Baltimore, MD. In 2006, Dr. Hines joined Crystal Run Healthcare. 

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Jonathan Nasser MD

Chief Clinical Transformation Officer, Medical Director

Jonathan Nasser, MD is Crystal Run Healthcare’s Chief Clinical Transformation Officer, Medical Director, and physician leader for Crystal Run Healthcare’s Pediatrics division. Dr. Nasser is board certified in Pediatrics and Internal Medicine. Dr. Nasser earned his Medical Degree from the University of Virginia in Charlottesville, VA, and completed his residency at the University of Rochester Medical Center in Rochester, NY. In 2002, Dr. Nasser joined Crystal Run Healthcare. As Chief Clinical Transformation Officer, Dr. Nasser is responsible for instituting programs that advance Crystal Run’s transition to value based care. 

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