Britannica Educational Publishing 
Top 101 Philosophers [PDF ebook] 

Although their methodologies, areas of focus, and conclusions may diverge greatly, all philosophers in some form or another pose questions about universal truths. These individuals have elevated discourse and changed the way we interpret the world around us. Profiles of 101 of the most noteworthy individuals in the field introduce readers to the various philosophical schools of thought, as well as the ongoing questions and debates that have occupied philosophers and non-philosophers alike for centuries.