sentences:  He continued his studies in France, completing a DSU in administrative law from University of Paris II (Panthéon-Assas) in 1979, a DEA and a third-cycle doctorate in general public law from Paris Nanterre University in 1982.In 1988, Borwornsak became a policy advisor at the Secretariat of the Prime Minister, rising to deputy secretary to the Prime Minister for policy matters the following year.In 1991, he returned to his academic function, teaching administrative law at Chulalongkorn University.