[Wikipedia] Seán Francis Lemass was an Irish Fianna Fáil politician who served as Taoiseach and Leader of Fianna Fáil from 1959 to 1966. He also served as Tánaiste from 1957 to 1959, 1951 to 1954 and 1945 to 1948, Minister for Industry and Commerce from 1957 to 1959, 1951 to 1954, 1945 to 1949 and 1932 to 1939