Christopher O'Dowd (born 9 October 1979) is an Irish actor, best known for comedic roles such as Roy Trenneman in the Channel 4 comedy The IT Crowd. O'Dowd created and starred in the Sky 1 television series Moone Boy, which aired between 2012 and 2015. He had a recurring role on the comedy-drama series Girls. O'Dowd is also known for his film roles, most notably Bridesmaids (2011), This Is 40 (2012), The Sapphires (2012), Thor: The Dark World (2013), Calvary (2014), and St. Vincent (2014). He made his Broadway debut in the play adaptation of Of Mice and Men in 2014, for which he was nominated for a Tony Award.