Host of MSNBC's The Last Word with Lawrence O'Donnell. Also a television writer and producer, he became known for his work on the popular NBC series The West Wing.
He graduated from Harvard University in the mid-1970s.
He played a recurring role as a lawyer on the popular HBO show Big Love.
His marriage to actress Kathryn Harrold produced a daughter named Elizabeth.
As a young man, he worked as an assistant to Senator Daniel Patrick Moynihan.