Sebastian Arcelus (born November 5, 1976) is an American actor, best known for his roles as Lucas Goodwin in the Netflix TV series House of Cards (2013–2016) and Jay Whitman in the CBS TV series Madam Secretary (2014–2019). Arcelus began his acting career in the early 2000s and spent the first decade of his career on Broadway, having played Roger in Rent, Fiyero in Wicked, Bob Gaudio in Jersey Boys, and Buddy in Elf, among other roles. He returned to Broadway with the 2022 revival of Into the Woods and its subsequent national tour.

Early life and background
Arcelus grew up in Port Washington, New York. He is a first generation American of Uruguayan, Italian, and Russian descent, and speaks Spanish fluently. He is a graduate of Williams College.