This is the only biography of Leonhard Euler currently available in English, and it would be worth having for that reason alone. (...) The book is a good introductory biography of Euler, and it is handsomely produced, with nice paper and lots of illustrations. It is a welcome addition to the literature on Euler. Fellmann has chosen to make this a non-technical biography. There are no mathematical details and no formulas. Short accounts of Euler's work are included, but few details are given. Even then, the sections that go into Euler's work are marked with asterisks so that readers who are not willing to delve into specifics can skip them. With non-technical readers in mind, Fellmann privileges those aspects of Euler's work that are more accessible, so his music theory gets much more attention than his work on elliptic integrals and his lunar theory and optics more than the geometry or number theory. -MAA Reviews