Dr. Resi Gerritsen and Ruud Haak are world-renowned specialists in the field of dog work and the authors of more than 30 titles on dog training. They serve as training directors and international judges for the International Red Cross Federation, the United Nations, the International Rescue Dog Organization and the Fédération Cynologique Internationale (FCI).Simon Prins has won international acclaim as an innovative trainer for his work with camera, explosive detection, and search and rescue dogs.