I was privileged to be Clifford's major professor during his doctoral research at Iowa State University. He was an exceptionally brilliant student. It was a delight to see his progress through difficult problems. I learned a great deal from mathematical methods he developed, and have continued to use some of them. Personally, Clifford was patient, kind, unselfish, and outgoing. He was often a guest in our home, and our five young children got to know him well. I am most gratified to learn, from the many comments from others who knew him, that he was so well liked and respected at the Weizmann Institute and the Rehovot community.