Dr. Clark is one of the best known ichthyologists, who began her studies on the behavior and reproductive isolating mechanisms of fresh-water aquarium fishes. She later combined her love for diving with study of marine fishes by first hard-hat diving or snorkeling, and now using scuba and submersibles, including ROVs. Her project involving sharks goes back three decades when she first conditioned sharks, training them to press a target to obtain food, then studied their ability to visually discriminate between targets of different shapes and color. She is now studying shark behavior in the deep sea from submersibles at depths of 1,000 to 12,000 feet. In the last 7 years she conducted 71 dives off Grand Cayman, Bermuda, the Bahamas, California, and Japan to study the behavior, movements, and population density of large deep sea fishes. Her other research program concerns the reproductive behavior, territoriality, and ecology of tropical sand-dwelling fishes of Papua New Guinea, the Caribbean, and Red Sea. This evolved from her earlier research on the behavior of garden eels and a shark-repellent "moses sole." Clark has been consultant and/or narrator, co-director, principal in 24 television specials about marine life in the U.S.A., Bermuda, England, Egypt, Israel, Japan, and Mexico. "Reef Watch" is the first live underwater TV documentary and the just completed "Search for the Great Sharks" is an IMAX film. She has been the recipient of 3 fellowships, 5 scholarships, 6 medals, and 32 other awards and citations for work in marine biology, conservation, and writing. She is currently Professor Emerita and Senior Research Scientist at the University of Maryland.