HAHN OTTO: (1879-1968) German Chemist. Nobel Prize in Chemistry, 1944, for his discovery of nuclear fission. Considered "The Father of Nuclear Chemistry" and regarded as one of the most significant chemists of all time. A good and unusual signed 6 x 4 photograph by Hahn, the Stuhler image from Landau shows the German chemist standing in a half-length pose alongside a colleague. Signed in blue fountain pen ink with his name alone to the upper right corner. VG