Forgetting a man like Wallace Shawn? Inconceivable! Just wait until you hear his roar.
There is no one role than can define Wallace Shawn because he has performed such a wide variety of roles, and everyone knows him in at least one of them, even the minor ones. His voice is just that iconic and his face that memorable. Now, he plays the stout knight Manny in King's Quest.
Perhaps you've seen/heard him in: