Head squash coach Bob Callahan ’77 underwent surgery for a brain tumor in early March. Callahan — whose team won the national championship in February with a spectacular win over traditional powerhouse Trinity — said at the end of the month that he feels “great and strong, and I’m very lucky to have such incredible support going through this.” He was touched, he said, by more than 1,000 emails from former players, Princeton parents, friends, and colleagues offering him their best wishes. Callahan has been the head squash coach at Princeton for 30 years.