The book "Gerhard Gentzen" offers a comprehensive examination of the life and significant contributions of Gerhard Gentzen, an outstanding German mathematician and logician. Born in 1909 in Greifswald, Gentzen is known for his foundational work in mathematics and proof theory, particularly in the areas of natural deduction and sequent calculus. His research has profoundly influenced the development of mathematical logic. The book highlights not only his scientific achievements but also the tragic circumstances of his life, which were shaped by World War II and his subsequent arrest in Prague. This publication is a valuable resource for anyone interested in the history of mathematics and logic and provides deeper insights into Gentzen's impact on modern mathematics.