All the authors of the sixteen essays gathered in this volume are concerned, in their different ways, to clarify, criticize, and develop key ideas and insights of Alfred North Whitehead (1861-1947), one of the towering figures of twentieth-century speculative thought, whose process philosophyhas, in recent decades, aroused intense intellectual interest both in this country and abroad. The present volume is intended to complement, but not to duplicate, an earlier selection of important Whitehead studies, Alfred North Whitehead: Essays on His Philosophy, ed. G. L. Kline (Englewood Cliffs: Prentice Hall, 1963).