Kenneth Lonergan is an American playwright, screenwriter, and director. His theatrical works include Lobby Hero, Outer Critics Circle Award-winner for Best Play (Playwrights Horizons/John Houseman Theatre); Pulitzer Prize Runner-up, The Waverly Gallery (Williamstown Theatre/Promenade Playhouse); This Is Our Youth (West End Theatre); and The Starry Messenger, premiering Off-Broadway (Acorn Theatre).

He co-wrote the film Gangs of New York which garnered a WGA and Academy Award nomination for Best Original Screenplay. His Academy Award nominated film for Best Screenplay, You Can Count On Me, which he wrote and directed, won the Sundance Grand Jury Prize and Waldo Salt Screenwriting Award, the N.Y. Film Critics Circle, L.A. Films Critics Circle, Writers Guild of America and National Board of Review Awards for Best Screenplay, the AFI Awards for Best Film and Best New Writer, as well as the Sutherland Trophy at the London Film Festival.