Michael Bradley Enzi ( EN-zee; February 1, 1944 – July 26, 2021) was an American politician who served in the United States Senate from Wyoming as a member of the Republican Party from 1997 to 2021. Prior to his tenure in the United States Senate he served as mayor of Gillette, Wyoming, in the Wyoming House of Representatives from Campbell County, and the Wyoming Senate from the 24th district. He was the longest-serving senator from Wyoming since Francis E. Warren. Enzi was born in Bremerton, Washington, raised in Thermopolis, Wyoming, and educated at Sheridan High School, George Washington University, and the University of Denver. He served in the Air National Guard, and held positions in the American Legion Boys State, DeMolay International, and United States Junior Chamber. He entered politics with his election as mayor of Gillette after being convinced by Alan Simpson to run and defeating incumbent Mayor Cliff Davis. He was elected to the state house in the 1986 election and served until his appointment to the state senate in 1991. Enzi was elected to the United States Senate in the 1996 election after defeating future senator John Barrasso in the Republican primary and Secretary of State Kathy Karpan in the general election. During his tenure in the Senate he served as chair of the Health, Education, Labor and Pensions, and Budget committees. He served in the Senate until Cynthia Lummis succeeded him in the 2020 election after his retirement. He died in 2021 following injuries resulting from a bicycling accident.