Mark Ruffalo is an actor.
Mark Alan Ruffalo ( [ ˈrʌfəloʊ ] , born November 22 , 1967 ) is an American actor , humanitarian , social activist and film producer . Following were his roles in 13 Going on 30 ( 2004 ) , Eternal Sunshine of the Spotless Mind ( 2004 ) , Zodiac ( 2007 ) , and What Does n't Kill You ( 2008 ) . In 2010 , he starred in the psychological thriller Shutter Island and the comedy-drama The Kids Are All Right . Ruffalo gained international prominence by portraying the Marvel Comics character the Hulk in The Avengers ( 2012 ) and Avengers : Age of Ultron ( 2015 ) . The same year , he portrayed Dave Schultz in Foxcatcher , for which he was nominated for awards , including a Golden Globe , and an Academy Award for Best Supporting Actor .