Hans Gustav Adolf Hellmann (October 14, 1903 – May 29, 1938) was a German theoretical physicist.Hellmann was born in Wilhelmshaven, Prussian Hanover. He began studying electrical engineering in Stuttgart, but changed to engineering physics after a semester. Hellmann also studied at the University of Kiel.He received his diploma from the Kaiser Wilhelm Institute for Chemistry in Berlin under Otto Hahn and Lise Meitner. He received his Ph.D. at Stuttgart with Prof.