The Social Democratic leaders Ernst Wigforss, an avid Keynesian, Gustav Möller and Per Albin Hansson, a social corporatist, are considered the main architects of "folkhemmet", with inspiration from the conservative Kjellén and the Danish Social Democrats C.V. Bramsnæs and Karl Kristian Steincke. It was later developed by Prime Ministers Tage Erlander and Olof Palme until the Social Democratic Party lost power in 1976. Another important proponent was Hjalmar Branting, who came into contact with the concept while a student at Uppsala University, and went on to become the first socialist Prime Minister of Sweden.