David Wheeler, known professionally as David Thewlis, is an English actor, author, director, and screenwriter. He rose to prominence starring in the film Naked (1993), for which he won the Cannes Film Festival Award for Best Actor. His most commercially successful roles to date have been Remus Lupin in the Harry Potter film series (2004–2011) and Sir Patrick Morgan / Ares in Wonder Woman (2017). Other notable film appearances include James and the Giant Peach (1996), Dragonheart (1996), Seven Years in Tibet (1997), Kingdom of Heaven (2005), The Boy in the Striped Pyjamas (2008), War Horse (2011), The Theory of Everything (2014), Anomalisa (2015), and I'm Thinking of Ending Things (2020). He will appear in Avatar 3 (2024). On television, Thewlis portrayed Cyrus Crabb in the ABC miniseries Dinotopia (2002) and V. M. Varga in the third season of Fargo (2017), with the latter earning him nominations for an Emmy Award, Critics' Choice Television Award, and Golden Globe Award. He provides the voice of the Shame Wizard in the Netflix animated sitcom Big Mouth (2017–present).