David Wheeler (born 20 March 1963), known professionally as David Thewlis, is an English actor, director, screenwriter, and author. Thewlis first rose to prominence for playing Johnny Fletcher 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 and Sir Patrick Morgan / Ares in Wonder Woman (2017). Other notable film appearances include 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), and Anomalisa (2015). He also 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). He currently is working on Avatar 2 & 3.