Ulbo de Sitter

Lamoraal Ulbo de Sitter (6 March 1902 – 12 May 1980) was a Dutch geologist at Leiden University, where he was the founder of the school of structural geology.

[1][2] De Sitter studied geology in Switzerland and later at Leiden, where he was a pupil of geologists Karl Martin (1851–1942) and Berend George Escher (1885–1967).

De Sitter's task was to supervise fieldwork and research in the Bergamo Alps (northern Italy).

He worked together on these experiments with Philip Henry Kuenen, an old friend from his student days who would later become a professor at Groningen.

De Sitter started a geologic research program in the Pyrenees and Cantabria (both in northern Spain) after the war.