sources:
Michael Greger is confirmed Jewish on his Wikipedia page: https://en.wikipedia.org/wiki/Michael_Greger
Joel Kahn admits to being Jewish in this interview: https://myjewishdetroit.org/2017/05/high-tech-high-touch-high-fiber/
Garth Davis made a Facebook post saying he is Jewish: https://facebook.com/drgarth/photos/a.639014966119415/976762239011351/?type=1&theater