Seth Wilbur Moulton (born October 24, 1978) is an American politician serving as the U.S. representative for Massachusetts's 6th congressional district since 2015. A former Marine Corps officer, he is a member of the Democratic Party. After graduating from Harvard University in 2001 with a Bachelor of Arts in physics, Moulton joined the United States Marine Corps. He served four tours in Iraq and then earned his master's degrees in business and public policy in a dual program at Harvard. He en ...