 From 1969 to 1971, Möller served as Federal Minister of Finance in the Cabinet of Willy Brandt.Besides being active in the SPD, Möller was director general of and Chief Executive Officer of the Karlsruher Lebensversicherung AG.Hence, his nickname was "Genosse Generaldirektor" (roughly, "Comrade general director"), which he also used as a title of his memoirs (1978).