Robert Laurence Barr Jr. (born November 5, 1948) is an American attorney and politician. He served as a federal prosecutor and as a Congressman. He represented Georgia's 7th congressional district as a Republican from 1995 to 2003. Barr attained national prominence as one of the leaders of the impeachment of President Bill Clinton. During his time in the House of Representatives, he authored the Defense of Marriage Act, which was later overturned.