trygve de lange was secretary-general from 1947 to 1976. the chairmen were odd berg (1947–1952), knut halvorsen (–1965), johan hjort (1965–1968), jens c. hagen (1968–), hjalmar aass (–1978), birger halvorsen (1978–), johan fredrik biermann, sverre sunde and sigurd herlofson (1980s).