Mark Alan Ruffalo born November 22, 1967 is an American actor and producer. He began acting in the early 1990s and first gained recognition for his work in Kenneth Lonergan's play This Is Our Youth (1998) and drama film You Can Count On Me (2000). He went on to star in the romantic comedies 13 Going on 30 (2004) and Just like Heaven (2005) and the thrillers Zodiac (2007) and Shutter Island (2010); and received a Tony Award nomination for his supporting role in the Broadway revival of Awake and Sing! in 2006. Ruffalo gained international recognition for playing Bruce Banner / Hulk in the Marvel Cinematic Universe superhero films The Avengers (2012), a cameo in Iron Man 3 (2013), Avengers: Age of Ultron (2015), Thor: Ragnarok (2017), Avengers: Infinity War (2018), a cameo in Captain Marvel (2019), and Avengers: Endgame (2019). Also in 2019, Ruffalo starred in and co-produced Dark Waters.

Ruffalo gained nominations for the Academy Award for Best Supporting Actor for playing a sperm-donor in the comedy-drama The Kids Are All Right (2010), Dave Schultz in the biopic Foxcatcher (2014), and Michael Rezendes in the drama Spotlight (2015). He won the Screen Actors Guild Award for Best Actor in a TV Movie for playing a gay writer and activist in the television drama film The Normal Heart (2015), and the Primetime Emmy Award for Outstanding Lead Actor in a Limited Series or Movie for his dual role in the miniseries I Know This Much Is True (2020). During his career, Ruffalo has been nominated for at least one Emmy, Grammy, Oscar and Tony award, one of a select group in history to have been nominated for all four awards.