Philip Johnson on Paul Rudolph

"Rudolph and I never could keep up the same quality of conversation because Rudolph is an artist. That really, I suppose, has been his problem throughout life. He is a real artist. He knew what he wanted, knew what shapes he wanted. And he was more interested in those than he was in the – although there's nothing wrong with his intellect. He's a great teacher, as you know. Oh, my God, you were his student, weren't you? But somehow you wouldn't put him in that class of intellectual."

Johnson, Philip, 1906-2005, and Robert A. M. Stern. The Philip Johnson Tapes: Interviews by Robert A.M. Stern. Ed. Kazys Varnelis. New York: Monacelli Press, 2008. pp. 99-100.