Constantinos Delicostopoulos graduated from Athens College in 1990 as Valedictorian, winner of the Howland Prize and President of the Student Council. He holds undergraduate degrees in law from the London School of Economics and from the University of Paris 2 Panthéon-Assas. He pursued further studies at the University of Paris 2 Panthéon-Assas, where he received his Master’s degree in law, magna cum laude, and his Doctorate in law, summa cum laude, in 2000. He was an annual visiting researcher at Harvard Law School. During his postgraduate studies, he held scholarships from the French state and the Onassis Foundation. He went on to serve as asst. Professor of private law at the University of Paris 2 and at the Institute of Judicial Studies of the same University.

During the 2010s, he was the executive Vice-President of Greece’s regulatory agency for telecommunications & posts. He is an Attorney at law before the Supreme Court and an associate of the Scientific Council of the Hellenic Parliament. He sits on the Board of Directors of the Friends of Music Association.