Dieter Held

Dieter Held (born 1936) is a German mathematician. He is known for discovering the Held group, one of 26 sporadic finite simple groups.
Held was a speaker at the 1962 International Congress of Mathematicians. He earned his Ph.D. in 1964 from Goethe University Frankfurt, under the supervision of Reinhold Baer. His discovery of the Held group occurred while he was working in Australia with Zvonimir Janko. Since then, he returned to Germany, and is a University Professor at the University of Mainz.