Doran founded OM with Fredy Studer, Urs Leimgruber, and Bobby Burri in the 1970s; this ensemble recorded for ECM.

He and Studer also worked on a Jimi Hendrix tribute project in the 1990s.

Doran has worked with free jazz and avant-garde jazz musicians such as Marty Ehrlich, Robert Dick, Ray Anderson, Han Bennink, Albert Mangelsdorff, Louis Sclavis, Marilyn Mazur, Herb Robertson, John Wolf Brennan, Patrice Héral [de], Jamaaladeen Tacuma, Phil Minton, Joe McPhee[1] and Carla Bley.

[2] Doran founded New Bag in 1997 and toured the world from 1998 to 2000 with the ensemble.

[3] With Ray Anderson and Han Bennink With Joe McPhee