Louis A. Pipes (1910-71) joined the faculty of UCLA in 1947 and remained there for the rest of his life. Previously, he taught for eight years at Harvard and for one year at the Rice Institute. This, his first book, was translated into many languages and since 1970 has ranked among the most widely used references on the subject. Lawrence R. Harvill is Professor Emeritus of Engineering Science at the University of Redlands in California.