William Thomas Hallenback Jr., known as Thomas, was an American anti-nuclear activist and simple-living adherent who undertook a 27-year peace vigil – the longest recorded vigil in US history at the time, with the title passing to his co-protester Concepción Picciotto after Thomas' death – in front of the White House.
- Occupation
- activist, peace activist
- Citizenship
- United States
- Born
- March 20, 1947
- Died
- January 23, 2009