An American political writer, he is best known for works such as Republican Gomorrah: Inside the Movement that Shattered the Party (2009) and Goliath: Life and Loathing in Greater Israel (2013). As a journalist, he wrote for both Al Akhbar and The Daily Beast.
He earned a degree in history from the University of Pennsylvania in 1999.
He once worked for Media Matters for America, a progressive watchdog organization.
He grew up in Boston, Massachusetts as the son of Sidney Blumenthal and Jacqueline Jordan.
His father, Sidney Blumenthal, worked as an aide to President Bill Clinton.