William Thomas Hader Jr.is an American actor, comedian, screenwriter, producer, and director. He was a cast member on the NBC sketch comedy series Saturday Night Live from 2005 to 2013, for which he received four Primetime Emmy Award nominations and a Peabody Award. He became known for his impressions and especially for his work on the Weekend Update segments, where he played Stefon, a flamboyant New York City nightclub tour guide.
Hader co-created the HBO dark comedy series Barry (2018–2023) with Alec Berg, in addition to playing the title role as Barry Berkman. He also served as producer, writer and director, for which his efforts garnered him eight Emmy Award nominations for the series. He won two, consecutively, for Outstanding Lead Actor in a Comedy Series. He is a star and producer of the IFC mockumentary comedy series Documentary Now! (2015–2022) along with Fred Armisen and Seth Meyers. He was Emmy-nominated for his guest role in Curb Your Enthusiasm in 2022.
On film, he took supporting roles in Hot Rod (2007), Superbad (2007), Forgetting Sarah Marshall (2008), Adventureland (2009) and The BFG (2016), with leading roles in The Skeleton Twins (2014), Trainwreck (2015), and as an adult Richie Tozier in It Chapter Two (2019). He has done extensive voice work working on the Pixar films Inside Out (2015), Finding Dory (2016), Toy Story 4 (2019), and Lightyear (2022) as well as in films such as Cloudy with a Chance of Meatballs (2009), its 2013 sequel, The Angry Birds Movie (2016), its 2019 sequel, Sausage Party (2016) and upcoming The Cat in the Hat (2026).
