Johannes Wilhelm Heinrich Juilfs, also known by the alias Mathias Jules, (15 December 1911 – 1995) was a German theoretical and experimental physicist. He was a member of the ''Sturmabteilung'' (SA) and then, in 1933, of the ''Schutzstaffel'' (SS). Prior to World War II, he was one of three SS staff physicists who investigated the physicist Werner Heisenberg during the Heisenberg Affair, instigated, in part, by the ideological ''Deutsche Physik'' (German physics) movement. During the war, he worked as a theoretical physics assistant at the Kaiser Wilhelm Institute for Physics. During the denazification process after World War II, he was banned from working as a civil servant in academia. For a few years, he worked as a school principal, and then he took a job as a physicist in the textile industry. With the help of Heisenberg and the Minister of Lower Saxony, he was able to become a full professor at the Leibniz University Hannover.
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