Karen Pryor was a founder of Sea Life Park in Hawaii, where she pioneered many dolphin-training techniques. She is the author of numerous papers and several books, including Karen Pryor on Behavior: Essays and Research (1994), and has served on the U.S. Marine Mammal Commission. Kenneth S. Norris is Professor Emeritus of Natural History and Biology at the University of California, Santa Cruz, and one of America's senior mammalogists and conservationists. His work established that dolphins use echolocation. He helped draft the Marine Mammal Protection Act. His books include The Hawaiian Spinner Dolphin (California, 1994).