Comedian, writer, producer and radio host Greg Fitzsimmons hosts the Sirius XM Radio show “The Greg Fitzsimmons Show” and has performed stand-up on “The Late Show with David Letterman,” “Jimmy Kimmel Live!” and “Late Night with Conan O’Brien.” He has also filmed his own “Comedy Central Presents” stand-up special.

He has appeared on both of Louis C.K.’s sitcoms, “Louie” on FX and “Lucky Louie” on HBO, as well as on CBS’s “CSI: Crime Scene Investigation” and MTV’s “The Andy Dick Show.” Fitzsimmons is also a frequent roundtable panelist on E!’s “Chelsea Lately.” From 2003 to 2005, he worked as a writer and producer on “The Ellen DeGeneres Show,” for which he won four Daytime Emmy Awards.