This book is the result of a suggestion made to me by Erich Lehmann of the Department of Statistics of the University of California at Berkeley. Throughout the writing of it I have enjoyed his assistance and companion ship and that of his wife, Juliet Shaffer. In the beginning, writing about a man like Neyman, who was alive and still very active, I planned to limit myself to his recollections and records and to my personal observations of him during his eighty-fifth year. It soon became apparent, however, that I would need to supplement these with the recollections of his colleagues and...