He was educated in Wilhelmshaven and Stettin and went on to join the Holland America Line as an engineer candidate .
Leffers was born in Wilhelmshaven , the son of a naval engineer .
Leffers was educated in Wilhelmshaven and Stettin and went on to join the Holland America Line as an engineer candidate .
Leffers was born in Wilhelmshaven , the son of a naval engineer .