John Dingell Jr. (D) served in the U.S. House of Representatives as part of the Michigan delegation from 1955-2015. His 60 years in office make him the longest serving member in the history of the House. A long-time member of the House Energy and Commerce Committee, including 16 years as Chairman, Dingell was an advocate for environmental issues and a supporter of the Clean Air Act, the Clean Water Act, and the Environmental Protection Agency.  Dingell was also the longest serving Dean of the House of Representatives.