I met my wife, Margaret L. Mack, at the University of Chicago. We were married in 1936. She died in 1970.

The Chicago Economics Department was in intellectual ferment, although the central issues of the 1930's were very different from those in later times. I had never before encountered minds of that quality at close quarters and they influenced me strongly.

In 1975 I met Alison Brown and in 1982 we were married. She works for Cornell Computer Services.

My interests were aroused, and my faith in the cliches of the subject destroyed, as so often with other subjects, by the discussions with my friend, Aaron Director.

If you've never met a student from the University of Chicago, I'll describe him to you. If you give him a glass of water, he says, "This is a glass of water. But is it a glass of water? And if it is a glass of water, why is it a glass of water?" And eventually he dies of thirst.

I met my wife in South Dakota.