Films directed by writers

I’m interested in the idea of artists known primarily as literary writers crossing over into film direction (and not film writing which is much more common), so any suggestions for additions to the list would be appreciated. One film per writer.
Thank you to mubi users Ian, Laali, Arsaib, Mal(((o)))mbra, Two Dead Magpies, Apursansar, Lucas, Dirtybee, Ally the Manic Listmaker, Experimentofilm, Kenji, Martinus, Uli³Cain, Kleber, Montenegro, Risselda, Cat, Matt Parks, Nathan M, Aaron Garrett, Brentos and Johnde for their contributions…
Not listed:
‘Secret Friends’ Dennis Potter