Background
Schønheyder was born in Christiania to stipendiary magistrate Didrik Christian Sommerschild Schønheyder and Marie Katinka Maurer.
Schønheyder was born in Christiania to stipendiary magistrate Didrik Christian Sommerschild Schønheyder and Marie Katinka Maurer.
Schønheyder studied engineering in Kristiania and Hannover. He worked as ships engineer in Glasgow and Trondheim, and was assigned at the Ministry of Trade from 1918 to 1949. From 1949 to 1953 he worked for Nortraship.