High Quality Content by WIKIPEDIA articles! Einar Henry Gerhardsen (help·info) (10 May 1897 – 19 September 1987) was a Norwegian politician from the Labour Party of Norway. He was Prime Minister for three periods, 1945–1951, 1955–1963 and 1963–1965. With 17 years in office, he is the longest serving Prime Minister in Norway since the introduction of parliamentarism. Many Norwegians often refer to him as "Landsfaderen" (Father of the Fatherland); he is generally considered one of the main architects of the rebuilding of Norway after World War II.