John Hartman, Doobie brothers co-founder and drummer, dies at 72 Sep 25, 2022 Drummer John Hartman, the co-founder of the band Doobie Brothers, has died. He was 72 years old. Source: Thanks WIONews.com Share this:Click to share on Twitter (Opens in new window)Click to share on WhatsApp (Opens in new window)Click to share on Facebook (Opens in new window) Published in Cinema