Even though Beth already mentioned his name, it bears repeating - James Cromwell.

This guy is a wonderful character actor (portraying a variety of "types"). From his early days in tv comedies (as Stretch Cunningham on "All in the Family" and as the hotel manager in "Hot L Baltimore") to his more recent movie roles like the prison warden in "The Green Mile" and the President of the U.S. in "The Sum of All Fears" he's been consistently good.