John Henry Hoeven III is an American banker and politician serving as the senior U.S. Senator from North Dakota since 2011. A Republican, he served as the 31st Governor of North Dakota from 2000 to 2010. Prior to entering politics, Hoeven was a successful multi-millionaire banker. Hoeven was elected in 2010 to the U.S. Senate, succeeding incumbent Senator Byron L. Dorgan, who chose not to seek reelection. Hoeven became the senior Senator in 2013 after Kent Conrad retired and was replaced by Democrat Heidi Heitkamp, who was once Hoeven's opponent for the Governor's office. Hoeven was reelected in 2016.