Dr. Krantz is a mathematician at Washington University in St. Louis. He has published more than 65 books. His latest book, "A mathematician comes of age," explores the process of become mathematically mature. Dr. Krantz and I explore various aspects of that process, including why mathematics is one of the only intellectual disciplines in which one talks about maturing. We also explore mathematical beauty and maturity and how teachers and parents can create an environment that supports maturation.