Arnold Schönhage
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Arnold Schönhage (born 1934) is a mathematician and computer scientist and Professor Emeritus at Rheinische Friedrich-Wilhelms-Universität, Bonn. He was also professor in Tübingen and Konstanz. Schönhage now lives near Bonn, Germany.
Schönhage together with Volker Strassen developed the Schönhage-Strassen algorithm for fast integer multiplication that has a run-time of O(N log N log log N).
Schönhage designed and implemented together with Andreas F. W. Grotefeld and Ekkehard Vetter a multitape Turing machine, called TP, in software. The machine is programmed in TPAL, an assembler language. They implemented numerous numerical algorithms including the Schönhage-Strassen algorithm on this machine.