Diana Reiss (born 1948 or 1949 in Philadelphia, Pennsylvania ) is a professor of psychology at Hunter College and in the graduate program of Animal Behavior and Comparative Psychology at the City University of New York. Reiss's research has focused on understanding cognition and communication in dolphins and other cetaceans. Her important contributions include demonstrating mirror self-awareness in dolphins via the Mirror test. Her work in conservation and animal welfare includes "the protection of dolphins in the tuna-fishing industry and her current efforts to bring an end to the killing of dolphins in the drive hunts in Japan." She was the scientific advisor for The Cove and wrote The Dolphin in the Mirror: Exploring Dolphin Minds and Saving Dolphin Lives. Reiss earned a doctorate from Temple University.