gdcgraphics · CC BY-SA 2.0

Played Ross Geller for ten seasons on Friends, the role that made him famous worldwide and earned him a Screen Actors Guild Award. He'd already co-founded Chicago's Lookingglass Theatre Company before the show started, and kept working in theater throughout its run and after, making his West End debut in 2005. He also voiced Melman the hypochondriac giraffe across the Madagascar film franchise.