Alan "Allen" Leech is an Irish actor best known for his role as Tom Branson on the historical drama series Downton Abbey. He made his professional acting debut with a small part in a 1998 production of A Streetcar Named Desire, made his first major film appearance as Vincent Cusack in Cowboys & Angels, and earned an Irish Film & Television Awards nomination in 2004 with his performance as Mo Chara in Man About Dog.