Leiden University houses more than 40 national and international research institutes.

From 1603 to 1613 he was a teacher at the University of Leiden.

From 1835 he was a student at the University of Leiden.

He left for a position in the University of Leiden.

And from 1987 until 2011 a professor of public administration at the Leiden University.

He became a professor at the University of Leiden in 1886.

He was also a professor at the University of Leiden from 1976 to 1977.

In 1961, she received her law degree from Leiden University.

From 1966 to 1984 he was professor of international relations at Leiden University.

He studied law at Leiden University from 1961 to 1968.