While mathematics impacts many aspects of our lives, mathematicians aren't necessarily household names. This compendium introduces readers to a brilliant collection of original thinkers. The group encompasses ancient sages, Renaissance geniuses, Enlightenment-era polymaths, nineteenth-century innovators, some of the greatest minds of the twentieth century, and current leaders in the field. Also covered are the geniuses whose names are preserved in Fermat's Last Theorem, Boolean algebra, and the Fibonacci sequence. A great way for readers to familiarize themselves with a fascinating group of influential figures.