Bill Hader is an American actor, comedian, writer, and producer, best known for his work on the television show Saturday Night Live (SNL). He was a cast member from 2005 to 2013, where he gained fame for his diverse range of characters and impressions, including Stefon, a popular nightlife correspondent. In addition to SNL, Hader has appeared in various films and television series, such as Trainwreck and Barry, the latter of which he co-created and stars in. His work has earned him multiple awards and nominations, showcasing his talent in both comedy and drama.