The invention concerns a seat back (10) for an article of adjustable furniture comprising: a frame (12), at least one movable support section (14, 80) mounted for angular adjustment with respect to the frame; cam means (64) associated with one of the frame and the movable support section, cam follower means (58) associated with the other of the frame and the movable support section; actuator means (38) for moving said cam means or cam follower means associated with the frame with respect to the frame; whereby movement of said actuator means effects relative movement of said cam means with respect to said cam follower means and said relative movement effects angular adjustment of said support section relative to the frame to alter the seat back configuration. The present invention contemplates embodiments where the support section(s) comprise(s) an adjustable head rest (14), an adjustable lumbar support (80) or both.