 Prior to this, he was the past Chairman of Mount Sinai Hospital and the past Chairman of Mount Sinai Hospital Foundation

Hennick, along with his wife Barbara Hennick, founded the Jay and Barbara Hennick Family Foundation in 2008.In 2016, the Hennick Family Wellness Gallery opened at the Mount Sinai Hospital in Toronto.The Wellness Gallery houses the largest collection of the art works of iconic Canadian artist Sorel Etrog.