William Emerson Arnett is a Canadian and American actor and comedian. He is widely known for his roles as Gob Bluth in the Fox/Netflix sitcom Arrested Development (2003–2006, 2013, 2018–2019) and the titular character in the Netflix animated series BoJack Horseman (2014–2020). He has received nominations for seven Primetime Emmy Awards and three Screen Actors Guild Awards.
On television, Arnett is also known for his Emmy-nominated recurring role as Devon Banks in the NBC sitcom 30 Rock (2007–2013). He has also acted in films such as Hot Rod (2007), Blades of Glory (2007), Semi-Pro (2008), Teenage Mutant Ninja Turtles (2014), and Is This Thing On? (2025). Known for his deep baritone voice, his voice over roles include Ratatouille (2007), Horton Hears a Who! (2008), Monsters vs. Aliens (2009), Despicable Me (2010), The Lego Movie franchise (2014–2019), Teen Titans Go! To the Movies (2018), Chip 'n Dale: Rescue Rangers (2022), and Twisted Metal (2023–).
From 2020 to 2025, he hosted the Fox reality series Lego Masters. Arnett co-hosts the comedy podcast SmartLess (2020–) alongside Sean Hayes and Jason Bateman.
