Considered the "high water mark of his philosophical achievement," Whitehead's book is a rigorous inquiry into the data of science and will be enjoyed by students of philosophy and physics alike. English mathematician and philosopher ALFRED NORTH WHITEHEAD (1861-1947) contributed significantly to 20th-century logic and metaphysics. With Bertrand Russell he cowrote the landmark Principia Mathematica, and also authored The Concept of Nature, The Function of Reason, and Process and Reality.