He later became a professor at the University of Berlin.

Within the same year, he became a professor at the University of Berlin.

In 1848 he began teaching at the University of Berlin.

From 1900 to 1921 he was a professor at the University of Berlin.

He died while a professor at the University of Berlin.

In 1902 he became a professor at the University of Berlin.

From 1918, he was a professor at the University of Berlin.

After only one term he moved to University of Berlin.

He also taught at the University of Berlin from 1990 to 1993.

He also studied at the University of Berlin from 1890 to 1892.