John O’Reilly began his profession in the jazz genre, functioning as the drummer for Globe Fatha Jones. He also performed through the 1970s with JF Murphy and Spirit Up. His following move was onto the music group Whiplash, a rock and roll group. He registered as drummer for Rainbow in 1993, sticking to that group until 1995 when he became a member of Blue ?-yster Cult. He didn’t stick with that group for lengthy, heading back to Rainbow in 1996. He’s the drummer for Westworld. He in addition has performed with Randy Coven and Brian Gottesman.