Karl Stein
Karl Stein in Eichstätt, 1968
Born	Frank Reginald Nunes Nabarro (1913-01-01)1 January 1913 Hamm, Westphalia
Died	19 October 2000(2000-10-19) (aged 87) Ebersbach an der Fils, Baden-Württemberg
Alma mater	University of Münster
Known for	Stein manifold Stein factorization Behnke–Stein theorem Behnke–Stein theorem on Stein manifolds Remmert–Stein theorem
Awards	Cantor Medal (1990)
Scientific career
Fields	Complex analysis Cryptography
Institutions	Ludwig Maximilian University of Munich
Academic advisors	Heinrich Behnke
Doctoral students	Otto Forster Gunther Schmidt Martin Schottenloher

Karl Stein (1 January 1913 in Hamm, Westphalia – 19 October 2000) was a German mathematician. He is well known for complex analysis and cryptography. Stein manifolds and Stein factorization are named after him.

Career

Karl Stein received his doctorate with his dissertation on the topic Zur Theorie der Funktionen mehrerer komplexer Veränderlichen; Die Regularitätshüllen niederdimensionaler Mannigfaltigkeiten at the University of Münster under the supervision of Heinrich Behnke in 1937. Karl Stein was conscripted into the Wehrmacht sometime before 1942, and trained as a cryptographer to work at OKW/Chi, the Cipher Department of the High Command of the Wehrmacht. He was assigned to manage the OKW/Chi IV, Subsection a, which was a unit responsible for security of own processes, cipher devices testing, and invention of new cipher devices. He managed a staff of 11^[1] In 1955 he became professor at the Ludwig Maximilian University of Munich and emeritated in 1981. In 1990 he received the first Cantor medal.^{[citation needed]}

Students

Stein's doctoral students included Michael Schneider [de], Otto Forster, Ivo Schneider, Gunther Schmidt and Martin Schottenloher.