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 train search and rescue dogs for the International Red Cross and the United Nations (Office for the Coordination of Humanitarian Affairs), and they have trained drug and explosive detector dogs for the Dutch police and the Royal Netherlands Air Force. Gerritsen and Haak also act as international judges for the International Rescue Dog Organization.