Sebastian Stan (born 13 August 1982) is a Romanian-American actor. He is known for his television role as Carter Baizen in "Gossip Girl" and for his movie role as Bucky Barnes / Winter Soldier in the Marvel Cinematic Universe, beginning with 2011's "" and later also in (2014), Ant-Man (2015) "" (2016), "Black Panther" (2018), "" (2018), "" (2019) and in the Disney+ miniseries "The Falcon and the Winter Soldier" (2021). In 2015, he co-starred in Jonathan Demme's comedy-drama "Ricki and the Flash" and Ridley Scott's science fiction film "The Martian". In 2017, he portrayed Jeff Gillooly in the biopic "I, Tonya".