Person: Hoehnke, HansJürgen
HansJürgen Hoehnke was a German mathematician, born in what is now Poland, who studied algebra.
Mathematical Profile (Excerpt):
 Hoehnke was fourteen years old at this time and had become interested in shortwave radio.
 This was an interest which was viewed with suspicion by the Nazis so Hoehnke decided that he would look for another topic to pursue  he chose mathematics and physics and concentrated on these subjects for the rest of his school career.
 In 1943 Hoehnke graduated from school following the Abitur but given the wartime conditions there was no possibility for him to progress to a university education at that time.
 Hoehnke then began studying mathematics at university and was awarded his doctorate by the Martin Luther University in HalleWittenberg in 1952 after undertaking research under Heinrich Brandt.
 From 1956 until his retirement in 1990, Hoehnke worked at the Mathematical Institute of the Academy of Science of the German Democratic Republic.
 Hoehnke's early papers include Über die definierenden Gleichungen für Matrizeneinheiten in primären Ringen Ⓣ(On the defining equations for Matrix units in primary rings) (1956) in which he looks at multiplicative semigroups inside matrix rings over completely primary rings, Identische Kongruenzen für Polynome nach zusammengesetzten Moduln Ⓣ(Identical congruences of polynomials in composite moduli) (1956), and Nilpotenzkriterien Ⓣ(Criterion for nilpotence) (1957) in which he looks at conditions on a ring which force certain radicals to be nilpotent.
 Although Hoehnke continued to keep these interests, he also became interested in universal algebras, automata, categories and functors.
Born 27 October 1925, Free City of Danzig (now Gdańsk, Poland). Died 10 June 2007, Langenhagen, Germany.
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Origin Poland
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References
Adapted from other CC BYSA 4.0 Sources:
 O’Connor, John J; Robertson, Edmund F: MacTutor History of Mathematics Archive