Peter Venkman, Ph.D., is a fictional character from the Ghostbusters franchise. He appears in the films Ghostbusters, Ghostbusters II and Ghostbusters: Afterlife and in the animated television series The Real Ghostbusters. In both live action films, he was portrayed by Bill Murray, and was voiced in the animated series first by Lorenzo Music and then by Dave Coulier. He is a parapsychologist and the leader of the Ghostbusters.