Mark is a practicing Neurosurgeon in Greenwich, Connecticut. He is also Assistant Clinical Professor of Surgery at Columbia University.

He received his undergraduate degree from University of Rochester in New York and medical degree from Washington University School of Medicine in St. Louis Missouri.  After finishing his role as Chief Resident in the Department of Neurological Surgery at Barnes Hospital, he studied the molecular biology of pituitary tumors and astrocytoma during his research fellowship in the Departments of Neurological Surgery and Pharmacology at the Washington University School of Medicine.  He served on the Executive Committee of the Congress of Neurological Surgeons for nine years in many roles including Vice President and several committee chairmanships.  He is currently a member of the New York Regional Cabinet for Washington University.
He currently lives in Greenwich with his wife, Lindy and three sons.