After he had completed his studies at the Polytechnische Schule Karlsruhe and a commercial school at Antwerp he like his brother Joseph Thyssen joined the bank of his father Friedrich Thyssen.
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He was the beginner of the Thyssen fortune and the father of August Thyssen and Joseph Thyssen, both of whom joined his bank.
Saur went back to Thyssen in 1929 and was director of the August Thyssen-Hütte.