I only recently found out about Koenig's film career... it's mentioned in the liners to the 4CD Contemporary Story set, which the 2001 crooks had for a few euro-zlotys, recently. Don't have it at hand, but it's pretty obvious that he was talented there, too, working with William Wyler (swiss origin, btw, swiss name, at least).
*****
Is that Gitte CD reissue worth the many $$ it goes for? She's mostly been associated with what's the worst offense to culture them Krauts invented ever since 1945... yuck!