 Roland Sprague

Roland Percival Sprague (11 July 1894, Unterliederbach – 1 August 1967) was a German mathematician, known for the Sprague–Grundy theorem and for being the first mathematician to find a perfect squared square.With two mathematicians, Thomas Bond Sprague and Hermann Amandus Schwarz, as grandfathers, Roland Sprague was also a great-grandson of the mathematician Ernst Eduard Kummer and a great-grandson of the musical instrument maker Nathan Mendelssohn (1781–1852).