John Clarke has been a diving scientist with the U.S. Navy for thirty-eight years, conducting research specializing in the adaptations of people and animals to the deep-sea. That research began at the Georgia Institute of Technology (Georgia Tech) and Florida State University, culminating in research in the Puerto Rico Trench and participation in the U.S. Navy Scientist in the Sea Program. The University of Florida School Of Medicine provided NIH-funded postgraduate training in human medical physiology. His Navy research began at the Naval Medical Research Institute, Bethesda, MD and continues at the Navy Experimental Diving Unit in Panama City, Florida. He has conducted diving research in both Antarctica and the Arctic, and aviation research for the Navy and Air Force. He is a Physical Scientist and holds a Ph.D. in Physiology. He lives in Panama City, Florida, USA.