Mark Ruffalo with Murray Monster.
Mark Ruffalo (b. 1967) is an Academy Award-nominated American actor best known for starring in films, such as Eternal Sunshine of the Spotless Mind, Shutter Island and The Kids Are All Right.
Ruffalo appeared on Sesame Street to explain the word "empathy" in a Season 42 Word of the Day segment. (YouTube)
Other screen credits include Where the Wild Things Are and playing The Incredible Hulk in the 2012 feature film The Avengers.
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