Nicholas Rescher stands as a major figure in American Philosophy today. His philosophical contribution, ranging over fifty years, is marked by a profound respect for the fate of the human condition in a world of unparalleled scientific and technological innovation. This work brings under the centrally unifying theme of ''rationality'' some of the issues on values and personal responsibility he has addressed during his long and distinguished career. The book is intended to illustrate the synthesis of Rescher’s thinking relative to these ideas, as expounded upon for many decades.