Izaak had been in some five concentration and work camps over two years during the War and had lost much of his will to live or communicate until, while in a work camp with a number of captured French resistance fighters, “I learned again something of the meaning and exercise of human kindness. Something that I knew from my childhood but that had left me during these times,” he told me.

Andrew Patner has a inspiring, fascinating obit for Izaak Wirsup, a University of Chicago mathematician who passed away Friday at the age of 93.