Martin Kruskal was a friend and colleague. He and Laura were very helpful when Chiara and I moved to Princeton. After his death, I was one of those who edited his Wikipedia page, which can be found here:

https://en.wikipedia.org/wiki/Martin_David_Kruskal

The statements in this article about Martin's personal life are consistent with and in some cases based on my recollections. This is so, for example, of the assertions about Martin's family, his secret envelope, and what he used to say about the Kruskal Count. I am sure many of Martin's friends and colleagues who knew him better than I did could elaborate on some of these matters in much more detail. I am providing this information here because a Wikipedia editor very sensibly asked for a reference to some statements in the Wikipedia article about Martin. I felt that the best way to answer was to provide this information on my own website.

- Edward Witten