Michael Bradley Enzi 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.

Gillette is a city in and the county seat of Campbell County, Wyoming, United States. The town was founded in 1891 as a major railway town on the Chicago, Burlington and Quincy Railroad.