Kurt Diebner – Head of the RFR nuclear physics experimental site at Stadtilm in Thuringia and director of the Versuchsstelle (testing station) of the Heereswaffenamt (HWA, Army Ordnance Office) in Gottow. Abraham Esau – Head of the physics division from 1937 to the end of 1943. Plenipotentiary for nuclear physics from December 1942 to 1943, then plenipotentiary for high-frequency physics.[9] Walther Gerlach – Replaced Abraham Esau as head of the physics division and plenipotentiary for nuclear physics on 1 January 1944.