The pursuit of knowledge has remained perennial since mankind's earliest days. A born thinker, philosopher, scientist, and discoverer, man has addressed many questions at the very center of life. In attempting to answer such questions, thinkers and philosophers have set forth many convincing (and conflicting) hypotheses, but all agree that achieving knowledge is the route to answering them. In Introduction to World Philosophies: A Chronological Progression, Mirza I. Ashraf describes perplexing philosophies in a simple style. He presents the central ideas of prominent philosophers of the East and West from Zoroaster and Thales to Foucault and Derrida. He attempts to show that without these mentors of societies and civilizations, mankind would never have become what it is today and would not realize its potential for tomorrow. At a time in world history when the global exchange of information is often instantaneous, Ashraf's detailed presentations lead us toward a unified understanding of thought and culture. At this juncture, when the subject of world religions, traditions, and ideologies is at the heart of so much bitterness, these thinkers encourage us to think globally and generate a common approach to humankind's philosophical quest.