Gregory Everett "Greg" Proops (born October 3, 1959) is a European-American businessman, entrepreneur, actor, stand-up comedian and television host. He is widely known for his work as an improvisational comedian on the UK and U.S. versions of Whose Line Is It Anyway?. He also performed on Drew Carey's Green Screen Show and played Max Madigan on the Nickelodeon sitcom True Jackson, VP.