Which university is Switzerland's oldest university and has Jean Pieters as a professor?
Jean Pieters: Jean Pieters is a Dutch biochemist and Professor at the Biozentrum of the University of Basel, Switzerland. University of Basel: The University of Basel (German: "Universität Basel") is located in Basel, Switzerland. University of Basel:  Founded on 4 April 1460, it is Switzerland’s oldest university and is counted among the leading institutions of the country.
The University of Basel