Michael - I was going to say film directing. I'll leave others to connect the dots to gca, but here's five directors:
Frank Capra; Orson Welles; Sidney Lumet; Martin Scorcese; Steven Speilberg
All of them know how to use a camera; all of them know how to block a scene (and use space and locations); all of them know how to direct actors; all of them understand narrative (most were co-writers) and how to maifest that narrative in form; all of them understand pace and drama; all of them know how to open a movie, how to make a splash, and how to end a movie, how to leave lasting impressions; all of them handle large crews; all of them use other people's money, and lots of it; all of them entertain and elucidate; all of them were serious students of the art; all of them made movies that mattered; all of them strove to weave a personal vision through even the most populist work.
Frank Capra won Oscars and made several classics -- but was considered out-moded/old fashioned long before his well and talent had run dry, and wasn't asked (by the money men) to make even one movie during the last 40 years of his life.
Orsen Welles made his first movie exactly the way he wanted it and turned in a staggering and lasting accomplishment; but the powers that be tried to run him into the ground starting with his very next film, and never stopped.
Sidney Lumet made dozens of terrific films about all kinds of subjects, but he had a light (in my mind, wonderful) touch and not some overpowering style that dominated the movies, and so today hardly anyone mentions him as one of the greats.
Martin Scorcese grew up a sickly kid in New York watching every single movie he could from every era in Hollywood, finding something great and something he could learn from even in B-level Bibilcal costume dramas -- and then turned around and used all he learned to filter through his own psyche and vision and produce Mean Streets and Taxi Driver and Raging Bull -- and most of America (at last at first) winced in horror.
And Steven Speilberg - even as a young man a master of his craft and in the mold of the great old studio directors like Ford and Hawks; and he's made several truly excellent and wonderful films that deserve all the accolades they have gotten -- and yet, for some reason, I can only watch each of his movies once, and never felt a desire to watch them again.
Peter