Gisbert Hasenjaeger 1919–2006 Source: Wikimedia Commons About Gisbert Hasenjaeger German mathematician (1919-2006) People from the Same Era Åke Seyffarth 1919–1998 speed skater, sport cyclist Stockholm Agneta Swidén 1926–2014 drawing teacher, painter Copenhagen Eugen Seibold 1918–2013 geologist, university teacher Stuttgart William Frederick Harris 1918–1950 military personnel Lexington Petermax Müller 1912–2002 racing automobile driver, racing driver Potsdam Leonid Samoilovich Gittik 1926–2004 pedagogue, physician, writer Kharkiv