Resi Gerritsen , Ruud Haak

Ruud Haak was a Dutch dog trainer, author, and long-time editor-in-chief of the Dutch dog magazine *Onze Hond*. Together with his wife and training partner, Resi Gerritsen, he wrote more than 15 K9 training books and helped pioneer humane, positive-reinforcement methods for police and search-and-rescue dog training.