Okieriete "Oak" Onaodowan[1] (/oʊˌkɛdiˈɛteɪ oʊˈnaʊdəwɑːn/ oh-KED-ee-ET-ay oh-NOW-də-wahn;[2] born August 16, 1987)[3] is an American actor. He is known for his roles as Hercules Mulligan and James Madison in the 2015 musical Hamilton, and the role of Dean Miller in the ABC drama and Grey's Anatomy spin-off series Station 19. He was born in Newark, New Jersey.