Jason Jordan Segel (born January 18, 1980) is an American actor, author, and screenwriter. He is known for his role as Marshall Eriksen in the CBS hit sitcom How I Met Your Mother, as well as his work with producer Judd Apatow on the cult classic, short-lived television series Freaks and Geeks and Undeclared; the films Forgetting Sarah Marshall, Knocked Up, I Love You, Man, Gulliver's Travels, Bad Teacher, Despicable Me, The Muppets and The Five-Year Engagement. Wikipedia - IMDB