Thomas Cathcart graduated from Harvard with a degree in philosophy, studied theology at the University of Chicago, and embarked on a “checkered career” (his words) from college teaching to hospice management until, at the age of 67, he started his writing life by coauthoring Plato and a Platypus Walk into a Bar with Daniel Klein. His new book The Trolley Problem comes out in September.  Mr. Cathcart and his wife live in New York City.