[3] In 1969, Zaret accepted a cardiology fellowship at Johns Hopkins Hospital and started studying under Richard Ross and Dick Conti.
As said in the Journal of Nuclear Cardiology, "Zaret and Strauss collaborated initially on a research project measuring coronary blood flow after the intracoronary injection of radioactive Xenon.
The same year this research was published, Zaret was drafted to the hospital at Travis Air Force Base in Sacramento Valley, CA.
He later served as Chief of Cardiology for 26 years, until 2004 and as Associate Chair of Clinical Affairs in the Department of Internal Medicine at Yale from 1994 to 2004.
His car plummeted off the overpass above Winthrop Street and crashed into a concrete wall, leading to him being pronounced dead at the scene.