John Byron Van Hollen (born February 19, 1966) is an American lawyer and politician who served as Attorney General of Wisconsin from 2007 until 2015. A Republican, he was elected to the office in November 2006 and took office on January 3, 2007, succeeding Democrat Peg Lautenschlager. Van Hollen did not seek reelection in 2014 and left office on January 5, 2015.