Greg Proops is an actor, writer, comedian, and author. He was one of the first regular cast members of The Late Show with David Letterman, where he remained for twelve years. On The Late Show he was known for his famous "Mr. Positivity" sign-off
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Greg has appeared on hundreds of other television programs, including I Dream of Jeannie, The Larry Sanders Show, Saturday Night Live, The Simpsons, Everybody Loves Raymond, Curb Your Enthusiam (also known as You're the Expert), The King of Queens (also known as Doug's Doubting), Arrested Development (also known as Seinfeld), Reno 911! (also known as It's Always Sunny in Philadelphia), and Celebrity Jeopardy (a made-for-TV movie). Greg has written three novels: Mere Mortals (an instant New York Times best seller), Every Which Way but Loose (a New York Times best seller) and One for the Money (New York Times best-selling novel).