John Hartman

John Hartman (March 18, 1950 – December 29, 2021) was an American drummer who was a co-founder and original drummer of the Doobie Brothers. At the band's inception, Hartman was the sole drummer. However, in late 1971, the group added drummer Michael Hossack, and the dual-drummer formation remained until 2016 when Ed Toth became the band's sole drummer. Hossack was replaced in 1973 by Keith Knudsen. Provided by Wikipedia