PhD students at the HPSL have to be enrolled as PhD students either at the University of Freiburg or at the University of Basel.
The administrative procedures for obtaining a PhD at the Faculty of Philology of the University of Freiburg are described here (German).
Information on the enrolment procedure at the University of Freiburg can be found here (English version also available).
For the University of Basel, the enrolment procedure is described here.
Further information on doctoral studies at the University of Basel’s Faculty of Humanities and Social Sciences can be found here.