The doctor is in. Or, more precisely, he is in touch with the times. The recipient of a 2008 honorary degree from Toronto's York University (recognizing his work as an environmental activist), actor Woody Harrelson is an outspoken advocate of all things green. Since becoming an A-list movie star, he's used his celebrity to promote a host of socially progressive causes, among them wilderness conservation, alternative fuels and the work of UNICEF. Last month, the man who first gained fame as the genial, if dim, TV barkeep Woody Boyd (during eight seasons of Cheers; 1985-93) opened a Culver City bistro called Sage, billed as the world’s first organic vegan beer garden. An ethical vegan since the 1980s, Harrelson eschews meat and dairy products, as well as sugar and flour — public stands that have made him a hero to PETA (People for the Ethical Treatment of Animals). Harrelson is probably best known, though, for his leadership in the campaign to legalize marijuana. In 1999, he narrated Canadian director Ron Mann's documentary feature Grass, a critical examination of the U.S. government's pot policy. Born on this day (July 23) in 1961, Woody Harrelson has shown himself to be much more than the fun-loving rowdy that he played in 1994's The Cowboy Way.