He was succeeded as editor and his work continued by Dr. William J. Morgan, who in turn was succeeded by Dr. William S. Dudley, and then by Dr. Michael J. Crawford.
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As a result of this in the late 1950s, Clark's work came to the attention of the Director of Naval History, Rear Admiral Ernest M. Eller at the Naval History Division of the Navy Department (now the Naval Historical Center) and the head of the Early History Branch in that office, Dr. William J. Morgan.
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A Republican and a Presbyterian, Clark was also a member of the Naval Historical Foundation, the Historical Society of Pennsylvania, the Pennsylvania Genealogical Society, and served as vice president of the Illinois chapter of the Sons of the American Revolution.
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He wrote several biographies of American naval captains, including John Barry (1745-1803), Nicholas Biddle (naval officer), Lambert Wickes, and John Young (naval officer) during the American Revolution, which were published by prominent academic presses, such as the Yale University Press and Louisiana State University Press.
William Shakespeare | William Laud | William Blake | William | William III of England | William Morris | William McKinley | William Howard Taft | William Ewart Gladstone | William the Conqueror | William S. Burroughs | Alexander Graham Bell | Clark Gable | William Shatner | William Faulkner | William Randolph Hearst | Bell Labs | William Wordsworth | William Tecumseh Sherman | William Hogarth | Prince William, Duke of Cambridge | William Penn | Taco Bell | William Jennings Bryan | William Gibson | William Wilberforce | Joshua Bell | Clark | William James | Petula Clark |