Don Ferguson, PhD, is a psychologist with Dean Health System in Madison, Wisconsin. He's a non-combat veteran and has worked with veterans and other PTSD sufferers, but doesn't specialize in this area. The author of Reptiles in Love: Ending Destructive Fights and Evolving Toward More Loving Relationships, he presents workshops for therapists and couples on the neurobiology of couples interactions and maintains a practice that includes couples therapy groups.