George Pólya was one of the giants of classical analysis in the 20th century, and the influence of his work can be seen far beyond analysis, into number theory, geometry, probability and combinatorics. This book serves both as a biography of Pólya's life, and a review of his many mathematical achievements by experts from a wide range of different fields. Last but not least the book finishes with two essays by Pólya himself which focus on how to learn to solve problems, a subject with which he was fascinated throughout his life.