Greg Fitzsimmons (April 05, 1966) is an American stand-up comedian, writer and television producer. He appeared numerous times on The Tonight Show with Jay Leno, Late Show with David Letterman and Late Night with Conan O'Brien. In 1996, Greg hosted the MTV game show Idiot Savants. He was also a regular commentator on Vh1's Best Week Ever and I Love The series. From 2003 to 2005, he was one of the writers and producers of The Ellen DeGeneres Show for which he won four Daytime Emmys. He went on to write for Louis C.K.'s sitcom Lucky Louie. He is a frequent guest on The Howard Stern Show on Sirius Satellite Radio, Howard 100, and has hosted his own show on Howard 101. Ironically, his father was the late New York City radio personality Bob Fitzsimmons who had been ridiculed by Stern during his career. He also frequently performs stand-up comedy with Stern sidekick Artie Lange who considers him, along with Nick DiPaolo and Dave Attell, to be one of today's best comedians.

Greg won 4 Daytime Emmys as a writer and producer on "The Ellen DeGeneres Show", before moving over to "Lucky Louie" on HBO in 2005. Following that, he was the Head Writer for "The Chelsea Handler Show" on E! and recently sold 6 episodes of a Celeb-Reality show to TV Land called "The Real Love Boat". As a stand-up comedian, he's has made regular appearances on "The Late Show with David Letterman", "The Tonight Show", "Late Night with Conan O'Brien", "Late Late Show with Craig Kilborn", and dozens of others. Greg was one of the first comedians ever given a second Half Hour Special on Comedy Central and has been a commentator on VH1's hit show "Best Week Ever" for several years. He's also appeared on VH1's "I Love the 70s, 80s and 90s". Greg hosted a Cable Ace Award winning game show on MTV called "Idiot Savants" and in 2001 The U.S. Comedy Arts Festival in Aspen handed Greg the prestigious "Jury Award for Best Standup Comedian." He's appeared on "The Howard Stern Radio Show" over thirty times. Howard recently referred to Greg as his favorite comedian who guests on the program. In November 2006 Greg will perform at Carnegie hall with Artie Lang. Greg helped create "The Gerry Red Wilson Foundation" which raises money for Spinal Meningitis, a disease which afflicted both Greg's wife and son, and took the life of his dear friend Gerry Red Wilson. Greg currently lives in Venice Beach with his wife, son and daughter.