is an American comedian, actor, author, and comedy writer. He is noted for his numerous stand-up comedy appearances in clubs, theaters, and on television; his biography of "Pistol" Pete Maravich; and his supporting comedic acting roles in The X-Files, The Larry Sanders Show, Curb Your Enthusiasm, Legally Blonde, 50 First Dates, The 40-Year-Old Virgin, and Step Brothers. He is currently the head monologue writer for NBC's Late Night with Jimmy Fallon.