This book provides a deep insight into the world of investment funds, particularly focusing on the fund manager within the Sauren fund concept. Eckhard Sauren describes the unique, personalized investment philosophy: We do not invest in funds; we invest in fund managers. What this means is quickly explained. It is not the performance of the fund that is crucial, but the person behind a fund who is primarily responsible for the success or failure of an investment fund. Can the fund manager explain their strategy? Is it convincing? Are they among the best in their field? Only when these questions can be answered positively will a Sauren fund of funds engage in its individual fund. This selection process creates a high barrier for fund managers and ensures sustainable success for investors.