Robert S. Siegler Robbie Case: A Modern Classic About 15 years ago, Robbie asked me what I thought of a talk we had just heard. I indicated that I hadn’t much liked it and noted several serious problems. Robbie agreed with all of the criticisms, but said that he nonetheless liked the talk, because there was one good idea in it that he could use. I agreed with him that the idea was a good one, but it took me a while to understand the wisdom of his position. If there’s one usef