David Kwaku Asamoah Gyasi (born January 2, 1980) is a British actor. He is best known for his roles in Cloud Atlas (2012) and Interstellar (2014). On television, he played the lead role of Lex Carnahan in The CW miniseries Containment (2016), Argeus in Carnival Row (2019 - 2023), and Foreign Secretary Austin Dennison in The Diplomat (2023 - present).