Stuart Milligan (born September 10, 1953, in Boston, Massachusetts) is an American actor and voice actor, 6′ ½″ (184 cm) tall, who relocated to the United Kingdom in 1979 and has been based there since. His parents, Phyllis and Charles Milligan, were both teachers. He is married to Rosie (Dutch-born) and they have two daughters, Sjanneke and Maaike. He is best known for his recurring role as flamboyant illusionist Adam Klaus in the BBC mystery-comedy Jonathan Creek (1998–2010, 15 episodes). His most notable film credits include an uncredited Salvage Team Leader in Aliens (1986, directed by James Cameron), Officer Walters in Outland (1981), Captain in Spy Game (2001, with Robert De Niro and Brad Pitt), Police Sergeant in Sky Captain and the World of Tomorrow (2004), Taylor Scott in Red Joan (2018, with Cate Blanchett), Secretary of State in Hunter Killer (2018, with Ashton Kutcher), and US President in Wonder Woman 1984 (2020). On television he appeared as CIA analyst Arthur O'Neill in The Assets (2014, 8 episodes), President Richard Nixon in Doctor Who (2011, 3 episodes), Terrance Penbrook in Silo (2023, Apple TV+), Major Mackay in The English (2022), and in Tom Clancy's Jack Ryan (2018) and Berlin Station (2016). As a voice actor he voiced Superman in BBC Radio 4's Superman On Trial (1988), Taki in Wicked City (1987, anime dub), Shunsuke Sengoku in Cyber City Oedo 808 (1990), Zack in Chuggington (US dub), and Mr. Green in the Clue video game (1997). On stage he performed in the original London production of Marilyn! (1983), Cord Elam in Oklahoma! (1998, with Hugh Jackman, West End), and Mr. Robinson in The Graduate (1991, Gielgud Theatre).