One of my good colleagues had an office space I’ll never forget. Inside the room were towers of books and papers covering the floor like stalagmites in a cave. Just to sit down I had to move books and papers from his couch to make space. It had always been like this in Mitch’s office - a scene seemingly of chaos and disorder. But, as I had grown to realize, that was merely an impression. In a typical wide-ranging conversation with Mitch, a topic would come up that would remind me of something. I’d say, “You know that reminds me of something you wrote a few years ago. Let’s see, what was that . . .?” Mitch would say, “Oh, I know what you’re talking about.” Then, he would get up and go over to one of those paper towers and move his hand down about a foot or so, and gently pull out a paper in which that exact topic had been addressed.