Tom Johnston, Patrick Simmons, Dave Shogren and John Hartman founded the Doobie Brothers in the fall of 1970.
[1] After the band released its self-titled debut album and recorded two tracks for 1972's follow-up Toulouse Street, Shogren was replaced by Tiran Porter and Michael Hossack was added as a second drummer in December 1971.
[4] In September 1974, the Doobie Brothers expanded to a six-piece when pedal steel guitarist Jeff "Skunk" Baxter left Steely Dan to join the group.
[8] After the release of its follow-up Livin' on the Fault Line, Johnston decided to leave the group due to stylistic differences, and embarked on a solo career.
[11] Baxter and Hartman were replaced by John McFee and Chet McCracken, respectively, while Cornelius Bumpus joined on saxophone and keyboards.
[12] After recording One Step Closer in 1980, Porter was replaced by Willie Weeks, and backup percussionist Bobby LaKind became an official band member.
[13] With both leading members Simmons and McDonald beginning to focus more on their respective solo careers, it was announced in March 1982 that the Doobie Brothers had disbanded.
[15] After a five-year absence, the Doobie Brothers reunited in May 1987 for a tour to benefit the Vietnam Veterans Aid Foundation, with a 12-piece lineup including Tom Johnston, Patrick Simmons, Michael McDonald, Jeff Baxter, John McFee, Tiran Porter, John Hartman, Michael Hossack, Keith Knudsen, Chet McCracken, Bobby LaKind and Cornelius Bumpus.
[16] Following the tour, the group reformed permanently and signed with Capitol Records, with a six-piece lineup of Johnston, Simmons, Porter, Hartman, Hossack and LaKind.
[35] In the spring of 2010, Skylark was forced to leave after suffering a stroke, with John Cowan returning to take his place on tour; Hossack temporarily left around the same time, due to continuing effects stemming from his 2001 accident, with Tony Pia substituting.