query: Who is the president of the University of Freiburg?
passage: University of Freiburg
When previous rector Prof. Dr. Jäger retired in 2008, law professor Prof. Dr. Andreas Voßkuhle was chosen as his successor. However, shortly after the start of his term, the Social Democratic Party of Germany nominated Voßkuhle as vice-president of the Federal Constitutional Court of Germany. Voßkuhle accepted the nomination, was confirmed, and took his seat on the court in May 2008. In July 2008, then vice-rector Prof. Dr. Hans-Jochen Schiewer was elected as successor to Voßkuhle. Schiewer has assumed the position of rector with the start of the winter term 2008/2009.
passage: Rector (academia)
The head of a German university is either called “Rektor” (rector) or "Präsident" (president). The difference is usually that a "Rektor" is elected by the Senate from among the professors of the university (which is the traditional method of choosing the head of a German university), while a "Präsident" need neither be a professor nor a member of the university (or of any university) prior to appointment. The "Rektor" is traditionally addressed as "Magnifizenz".