Am I a huge dork for knowing who all of these guys are????
James Tolkan is a pretty good example of a guy who used to pop up everywhere, but no one ever knew his name. There is no pic on his IMDB page, but you will know him from:
Top Gun ("You screw up just this much, and you'll be flying a cargo plane full of rubber dog**** out of hong kong.")
Back to The Future (Principal Strickland)
Masters of The Universe
And many more
Edit: found a little pic of him.