Popular Directors Who Important Work Was Outside of Directing?

But preferably, still movie related.

I was about to turn my computer off, but thought of this while I was finishing up a documentary on George Stevens and it sprung up this idea. I haven't given it much thought, but the first example was Martin Scorsese's work on restoring movies.

I'd say Orson Welle's theater career before he made Citizen Kane, but he still directed the stage plays.

Howard Hughes and airplanes