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Our Leaders

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

Jonathan Nasser, MD, MBA is the President of Crystal Run Healthcare. 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 President, Dr. Nasser oversees the executive team and works directly with Crystal Run’s Managing Partner and CEO to ensure the successful implementation of the Practice’s strategic goals.

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Steve Zeng MBA

Chief Financial Officer

Steve Zeng is the Chief Financial Officer at Crystal Run Healthcare. Mr. Zeng is a graduate of LeMoyne College in Syracuse, NY where he earned his Bachelor of Science in Accounting. Zeng also holds a Master of Business Administration in Management from the Stern School of Business at New York University.

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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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