Dr. Costin grew up in Jerusalem and Los Angeles, and completed his undergraduate studies at UCLA before obtaining his medical degree at Yale University in 1986. He did his internal medicine internship and residency at the New York Hospital (Weill Cornell), followed by a year in Comp-Care, the hospital's teaching group internal medicine practice. He then completed cardiology fellowship at the Hospital of the University of Pennsylvania. Before re-joining the faculty at Weill Cornell, he spent 32 years as a cardiologist with the Princeton Medical Group.