In the academic year 1939/1940 he was nominated ordinary professor.

Such was his success that in 1770 he was appointed ordinary professor.

The same year, he has been promoted to ordinary professor.

He also taught law, and in 1611 he was appointed ordinary professor of history.

He was an ordinary professor of this university since 1911.

Five years later he was made ordinary professor.

In 1881 he was appointed extraordinary, and in 1896 ordinary professor at Vienna.

In the same year he became ordinary professor for mathematics at the mining college of Clausthal.

In 1834, he became the university's "ordinary professor" for the History of Medicine.

From 1963 until his retirement in 1977, he was ordinary professor at the University of Hamburg.