Sir Joseph Rotblat (4 November 1908 – 31 August 2005), born Józef Rotblat, was a British-naturalised Polish physicist.
His work on nuclear fallout was a major contribution toward the ratification of the 1963 Partial Nuclear Test Ban Treaty.
A signatory of the Russell–Einstein Manifesto, he was secretary-general of the Pugwash Conferences on Science and World Affairs from their founding until 1973. He shared, with the Pugwash Conferences, the 1995 Nobel Peace Prize for efforts toward nuclear disarmament.
(photo source www.instpol.by)