Theodor Franz Eduard Kaluza (1885-1954). Born in Ratibor, Germany (now Raciborz, Poland). Studied mathematics at the University of Königsberg (now Kaliningrad, Russia) and became a lecturer there in 1910. In 1929 he received a professorship at the University of Kiel, and in 1935 was made full professor at the University of Göttingen. He wrote only a handful of mathematical papers and a textbook on “Higher mathematics for the practician” (cf. [423]).