I have many treasured memories of your dad. Besides being a father figure, big brother and a friend, he was a great pedagogue loved and cherished by all. It is an honor to be one of his students. I have learned a lot from him and kept and applied my learnings an entire career. May he rest in peace. Knowing him, he is going to continue to challenge all of his friends up there with witty questions and unsolved problems. I have a suspicious feeling that even Einstein and Newton will get their share.