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    • 1889 – 1891

    This photogravure reproduces a painting by American artist Daniel Ridgway Knight (1839-1924), who was born in Philadelphia, Pennsylvania and also spent time in France. The photogravure was part of a massive study of…

    • after 1920 – 1944

    Portrait of Leo Hendrik Baekeland (1863-1944), inventor of Bakelite, the first fully synthetic plastic.

    • circa 1900

    Portrait of Henry Heide (1846-1931), known in his time as the dean of American candy manufacturers. A native of Germany, Heide immigrated to the United States in 1866 and ran a retail grocery store in Pittsburgh before…