Thomas Mark Barrett is an American diplomat and politician who served as the United States ambassador to Luxembourg from 2022 to 2025. He previously served as the 44th mayor of Milwaukee, Wisconsin from 2004 until 2021.
- Occupation
- politician, lawyer
- Position held
- member of the State Senate of Wisconsin, member of the Wisconsin State Assembly, law clerk, United States representative
- Citizenship
- United States
- Born
- December 8, 1953