Ott-Heinrich Keller

He was born in Frankfurt–am-Main, and studied at the universities of Frankfurt, Vienna, Berlin and Göttingen.

As a student of Max Dehn he wrote a dissertation on the tiling of space with cubes.

Subsequently he worked with Georg Hamel in Berlin, habilitating in 1933 with a thesis on Cremona transformations.

The motivation for looking at rather general polynomial transformations, say of the projective plane, came from the singularity theory for algebraic curves.

After the war he had several positions, and was appointed a professor at Martin Luther University of Halle-Wittenberg in 1952, as successor of H. W. E. Jung.