Gregory Sebastian Fitzsimmons

Greg Fitzsimmons (born Gregory Sebastian Fitzsimmons, April 5, 1966) is an American stand-up comedian, actor, podcaster, and Emmy Award-winning television writer. Raised in Tarrytown, New York, his father Bob was a New York City radio and television personality who was one of the original presenters of Good Day New York and hosted the Jerry Lewis Muscular Dystrophy Telethon from 1973 to 1989. Greg began his stand-up career while attending Boston University, where he was part of the comedy troupe Uncontrolled Substance.

Fitzsimmons made his late-night debut in 1996 on the Late Show with David Letterman, and that same year began hosting MTV's Idiot Savants, which received a CableACE Award. He served as a writer on the first three seasons of The Ellen DeGeneres Show, for which he received four Daytime Emmy Awards. He was a regular commentator on VH1's Best Week Ever and made over 40 appearances on Chelsea Lately. A frequent guest on The Howard Stern Show, he began hosting The Greg Fitzsimmons Show on SiriusXM's Howard 101 in 2006, which ran until 2018.

Fitzsimmons has toured the United States as a stand-up comedian and performed on programs such as The Tonight Show with Jay Leno and Late Night with Conan O'Brien. In 2013, his one-hour special Life on Stage premiered on Comedy Central. He hosts the comedy podcast Fitzdog Radio, which by August 2023 had aired over 1,000 episodes, as well as Sunday Papers and Childish. His writing career began on Politically Incorrect with Bill Maher, and he has also written for The Man Show and HBO's Crashing. In 2010 he published the book Dear Mrs. Fitzsimmons: Tales of Redemption from an Irish Mailbox.