Woody Harrelson is primarily known as an acclaimed actor rather than a film director. He gained fame for his role in the TV show "Cheers" and has appeared in films such as "Natural Born Killers," "The People vs. Larry Flynt," and "Zombieland." Harrelson has also directed, notably the live film "Lost in London." Beyond acting and directing, he is an advocate for environmental and social causes, often using his platform to promote sustainability and peace.