Cornelius Mahoney "Neil" Sheehan (born October 27, 1936) is an American journalist. As a reporter for The New York Times in 1971, Sheehan obtained the classified Pentagon Papers from Daniel Ellsberg. His series of articles revealed a secret United States Department of Defense history of the Vietnam War and led to a US Supreme Court case, New York Times Co. v. United States, 403 U.S. 713 (1971), when the United States government failed to halt publication.
He received a Pulitzer Prize and a National Book Award for his 1988 book A Bright Shining Lie, about the life of Lieutenant Colonel John Paul Vann and the United States involvement in the Vietnam War.
Source: Neil Sheehan on Wikipedia.