Hans Kollwitz

Hans Kollwitz (14 May 1892 – 22 September 1971) was a German epidemiologist, eldest son of artist Käthe Kollwitz. He obtained his degree in medicine and psychotherapy in 1928. He was also a World War I veteran, in which he voluntarily served, after joining from the German Youth Movement where he was a ''Wandervogel''. Provided by Wikipedia