Peter Venkman, PhD is a fictional character from the Ghostbusters franchise. He appears in the films Ghostbusters, Ghostbusters II, Ghostbusters: Afterlife, Ghostbusters: Frozen Empire and in the animated television series The Real Ghostbusters and Extreme Ghostbusters. In those four 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. Dan Aykroyd originally wrote the script with John Belushi in mind to play the role of Peter but Belushi died of a drug overdose on March 5, 1982, leading Murray to get the role. Peter is a parapsychologist, initially a skeptic on the paranormal despite being a scientist on the subject, and the leader of the Ghostbusters.

Gerald David "Lorenzo" Music was an American writer, producer, performer and voice actor. Music began his career in the 1960s with his wife, Henrietta, forming the comedy duo Gerald and His Hen. He then became a writer and a regular performer on the controversial CBS variety show The Smothers Brothers Comedy Hour. In the 1970s, Music co-created the sitcom The Bob Newhart Show with David Davis and composed its theme music with his wife. He also wrote episodes for The Mary Tyler Moore Show and Rhoda, and got a major voiceover role for playing the unseen, but often heard, Carlton the Doorman in Rhoda. Music gained fame in the 1980s for voicing Jim Davis' comic strip character Garfield on twelve animated specials, and later in cartoons, video games, and commercials. His distinctive voice of Garfield was also emulated by other actors following his death in 2001.