One hit wonders: Directors of just one movie.

Thanks for all the suggestions!

Not on MUBI (last time I checked):

-CAREFUL, SOFT SHOULDER (Oliver H. P. Garrett, 1942)
-LES DENTS LONGUES (Daniel Gélin, 1955)
-THE OUTSIDER (Tony Luraschi, 1979)
-VED VEJEN (Max von Sydow, 1988)
-CONVERSATION WITH THE BEAS (Armin Mueller-Stahl, 1996)