Karl Ledersteger

Karl Ledersteger was an important geodesist and geophysicist.
After studies of astronomy, mathematics and geodesy he worked in Germany and later in the National Survey of Austria. Later he set up the scientific department of the Federal Office for Metrology and Survey, Vienna. In the 1950s he was appointed as a professor of geodesy and astrometry at the Technical University of Vienna. He was head of many research projects, and author of about 200 scientific articles. Still a standard work of astronomical and physical geodesy is his textbook of Erdmessung published 1969.
In 1958/59, Ledersteger was the first geodesist in Central Europe who published on the future fields of satellite geodesy. Other topics of his research were:

Theory of National survey - and practical computation of the ZEN and of parts of the ED50
Theory of equilibrium figures of Earth and planets
Isostasy of the Earth's crust and its effect on geoid determination; a main part was published posthumously by his successor Kurt Bretterbauer
the system of vertical deflections and the definition of reference ellipsoids.

Ledersteger was in intensive contact with the scientific community of whole Europe, US and Russia. For almost 20 years he was chair of ÖKIE and a member of many international commissions and research groups, e.g. in IUGG, DGK and scientific academies of Austria, Germany and Hungary.
Ledersteger received many prizes, several doctorates honoris causa and calls to universities. In Vienna he was asked to begin geodetic lectures immediately after World War II, but his professorship was postponed for 10 years because of his participation in Nazi surveys 1940–1945. He translated several works including a textbook of Magnizki & Browar on theoretical geodesy.