After finishing secondary school in 1925 in
Passau, Peschl started studying
mathematics,
physics, and
astronomy in
Munich. He received his doctorate in 1931 from the
University of Munich under the supervision of
Constantin Carathéodory with a dissertation titled
Über die Krümmung von Niveaukurven bei der konformen Abbildung einfachzusammenhängender Gebiete auf das Innere eines Kreises; eine Verallgemeinerung eines Satzes von E. Study ("On the curvature of level curves of the conformal mapping of simply connected domains to the interior of a circle: A generalization of a theorem of
Eduard Study"). This was followed by some years spent working as an assistant with
Robert König in
Jena and
Heinrich Behnke in
Münster. He habilitated in 1935 at the
University of Jena. Peschl took up a visiting professorship at the
University of Bonn in 1938, and was subsequently promoted to extraordinary professor there. Under pressure Peschl became a member of the
Nazi Party and the paramilitary
Sturmabteilung, but he avoided any activity within either organization and ended SA service after a year. From 1941 to 1943, he served as a
French interpreter for the
Wehrmacht. From 1943 to 1945, he worked at the German Aviation Research Institute in
Brunswick, which exempted him from further military service during
World War II. After the war Peschl became the director of the Institute of Mathematics in
Bonn, and in 1948 he became a full professor there. He promoted applied mathematics and established the Institute for Instrumental Mathematics in Bonn which evolved into the Society for Mathematics and Data Processing. He led the Society with
Heinz Unger from 1969 to 1974. == Work ==