Laura Siegemund is a world-class tennis player, two-time Grand Slam winner in doubles and mixed doubles, and two-time Olympian. She holds the highest coaching license from the German Tennis Federation, has a Bachelor of Science in Psychology, and lectures in competitive sports and business companies. Laura currently resides in the United States. Prof. Dr. Stefan Brunner is a sports scientist and mental coach. He coaches high-performance athletes in various sports. Brunner is an author, having also written for many journals and scientific articles, and university lecturer. He holds a doctorate in sports psychology.