He has conducted research on wolf population ecology and prey relationships in Alberta, and on wolf, white-tailed deer, and hunter interactions in Minnesota. He also has studied the ecology of jackals and African wild dogs in Kenya, foxes in Chile, and black bears, porcupines and fishers in Massachusetts. Dr. Fuller teaches courses in wildlife ecology, conservation, and management, while also guiding graduate students studying a variety of carnivores and herbivores in California, Massachusetts, Minnesota, Vermont, China, Costa Rica, Mongolia, and Papua New Guinea.