Karsh Signature

Yousuf Karsh, master photographer of the 20th century

Margaret Thatcher

Margaret Thatcher, 1976

Margaret Thatcher became Britain’s first female prime minister on this day, May 4, in 1979. She was in office from 1979 to 1990, making her the longest-serving British PM of the 20th century. Thatcher was photographed by Karsh in 1976 at the House of Commons, when she was Leader of the Opposition for the Conservative Party.