Philosophy and mathematics grew up together in the days of Pythagoras and Plato. Indeed, they have been in constant companionship and interaction ever since. This book examines 15 of these interactions, some dealing with the greats of history such as Aristotle and Leibniz, some addressing modern greats such as Einstein, Schrodinger, and Goedel, and some dealing not with themes, but rather the thinkers. Taken together they represent a characteristic sampling of the author’s philosophical investigations over more than three decades.