Jack Kramer (John Albert Kramer, 1921–2009), American tennis player
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Johann Ulrich von Cramer (1706–1772), German judge, legal scholar, and Enlightenment philosopher
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John G. Cramer (born 1934), professor of physics at the University of Washington in Seattle, SF author
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John R. Kramer (1937–2006), former Tulane University Law School dean
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