Byron Leslie Dorgan (born May 14, 1942) is an American author, businessman and former politician who served as a United States Representative (1981–1992) and United States Senator (1992–2011) from North Dakota. He is a member of the Democratic Party. As of 2011, he serves as a senior policy advisor for the Washington, DC law firm Arent Fox LLP. He was a member of the Senate Democratic leadership for 16 years, first as Assistant Democratic Floor Leader and then as Chairman of the Democratic Poli...