The book contains autobiographical material and short reprints of his work. The main content is in the exposition of his research contributions, sometimes with novel points of view, by students, grand-students, and colleagues. The research described was fundamental to the growth of a central part of 20th century mathematics that, now in the 21st century, is in a healthy state with much current interest and activity. The addition of personal recollections, professional tributes, and photographs yields a picture of a man, his personal and professional family, and his time.
Edited by: Linda Keen, Lehman College and the Graduate Center, CUNY, New York, NY, Irwin Kra, Stony Brook University, NY, and Rubí E. Rodríguez, Universidad de La Frontera, Temuco, Chile