Don Walsh (born November 2, 1931) is an American oceanographer, explorer and marine policy specialist. He and Jacques Piccard were aboard the bathyscaphe Trieste when it made a record maximum descent into the Mariana Trench on January 23, 1960, the deepest point of the world's oceans. The depth was measured at 35,813 feet (10,916 m), but later and more accurate measurements have measured it at 35,798 feet (10,911 m).
Walsh has been associated with ocean science, engineering, and marine policy for more than fifty years. He was commissioned as an officer in the United States Navy upon graduation from the United States Naval Academy in 1954. He attained the rank of captain by the time he retired. He spent fifteen years at sea, mostly in submarines, and was a submarine commander. He worked with ocean-related research and development for the navy. Serving as Dean of Marine Programs and Professor of Ocean Engineering at the University of Southern California, Walsh initiated and directed the university's Institute for Marine and Coastal Studies, and was a member of the board of directors for Omnithruster Inc., a marine maneuvering and auxiliary propulsion manufacture in nearby Santa Fe Springs. In 1989 his company, International Maritime Incorporated, contracted a joint venture with the P.P. Shirshov Institute of Oceanology to establish an underwater maintenance company, Soyuz Marine Service, which continues to operate in the Russian Federation. Walsh continues to support ocean sciences in his work on the Ocean Sciences Board at the National Academy of Sciences.
Walsh received a Bachelor's degree in Engineering from the U.S. Naval Academy, a Master's degree in Political Science from San Diego State University, and a master's degree and a Ph.D. in physical oceanography from Texas A&M University. He was appointed by Presidents Carter and Reagan to the U.S. National Advisory Committee on Oceans and Atmosphere, was a member of the Law of the Sea Advisory Committee for the U.S. Department of State, and served as a member of the Marine Board of the U.S. National Research Council from 1990 to 1993. In 2001, Walsh was elected to the National Academy of Engineering. Walsh holds a faculty appointment at Oregon State University in the College of Earth, Ocean, and Atmospheric Sciences.
Walsh was named one of the world's great explorers by Life magazine. In the MIR submersible, he dived on the RMS Titanic, the German battleship Bismarck, and the Mid-Atlantic Ridge. He has spent more than five decades traveling the world conducting research in, on, and around the oceans.
On April 14, 2010, The National Geographic Society bestowed its greatest honor, the Hubbard Medal, on Walsh in a ceremony in Washington, D.C. at the National Geographic headquarters. The U.S. Navy awarded Walsh its Distinguished Public Service Award.
Walsh lives with his wife Joan near Coquille, Oregon. He has managed a marine consulting business since 1976, and conducts about 5 deep-sea expeditions per year. He remains active with the National Academy of Sciences, the Ocean Elders, and is on the faculty of Oregon State University.
It was reported in 2010 that Walsh visited the deep-sea submersible Jiaolong and its makers at the China Ship Scientific Research Center. The craft had "planted a Chinese flag on the bottom of the South China Sea during a two-mile-deep dive in June" as the Chinese program—which Walsh characterized as "very deliberate" — proceeded toward its ambitious goal of going to 7,000 meters, or 4.35 miles, in 2012.
Walsh was the inspiration for Chris Wright's 2015 book No More Worlds to Conquer, and his interview constitutes the opening chapter. The book - about moving on from the defining moment in one's life - was inspired by Walsh's answer to Wright's question: what came next after the Trieste dive? Walsh responded: "Well, a lot of people think I died."