John Hartman (born 18 March 1950, in Falls Church, Virginia) is a U.S. 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 a second drummer Michael Hossack, and the dual-drummers formation has persisted ever since. Wikipedia
The definitive Wikipedia entry for John Hartman. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/John_Hartman