This book, written in German by Andreas K. Heyne and Alice K. Heyne and illustrated by Elena S. Pini, is dedicated to the life and work of Leonhard Euler (1707-1783), who was the pre-eminent mathematician of the 18th century and one of the greatest mathematicians of all time throughout the world. The authors and illustrator describe the most important moments from Euler's life in Switzerland, Russia and Germany. They show his significant discoveries in fields as diverse as analysis, algebra, geometry, topology, mechanics, optics, astronomy and geography. The remarkable book, written like a modern comic, is very readable and can be recommended to children, students and their teachers to attract their interest to mathematics and scientific investigation. It can also be recommended to anyone interested in mathematics, the history of mathematics or science.