One of Hollywood’s most versatile actors, Mark Ruffalo is on a constant search for new challenges.

Ruffalo has played characters ranging from a gay AIDS activist and a sperm donor to a recovering sex-addict and an FBI agent and will reprise his role as the Incredible Hulk in next year’s The Avengers: Age of Ultron.

An Academy Award nominee for 2010’s The Kids Are All Right, Ruffalo, 46, is appearing in US theatres in the musical film Begin Again and will be seen later this year as an Olympic wrestling champion in Foxcatcher. The versatile actor has also worked behind the camera on the award-winning film Sympathy for Delicious and is the founder of the non-profit group Water Defence, which works to keep water clean.

Ruffalo, whose brother was murdered in his California home in 2008, speaks about his aversion to violent roles, his washed-up record producer in Begin Again and a desire to return to Broadway.

Mark Ruffalo poses during a photocall for the film Foxcatcher at the 67th Cannes Film Festival in Cannes, earlier in May. The film will hit theatres later this year. — Reuters