Dr Andreas K. Theophilou received his PhD in 1971 from the University of Salford, UK, where he also worked as a research fellow on the electronic properties of metal surfaces. His earlier research work was on nuclear reactor physics and engineering at the “Demokritos” National Center for Scientific Research (NCSR), Athens, Greece. He completed his BSc Physics studies at the University of Athens and his MSc at the “Demokritos” Postgraduate School, Athens.
Leaving England after his PhD, Andreas worked on the magnetic properties of solids at the Technical University of Delft, the Netherlands, and later worked at the Technical University of Darmstadt, Germany. At the University of Antwerp, Belgium, he worked on the electronic properties of solids.
He returned to Athens in 1976, where he worked on the many electron problem at the NCSR. There, he developed many approximation methods based on symmetry and variational principles. One of his main achievements was the development of the excited state density functional theory (DFT) by introducing variational principles on subspaces. This was a generalization of DFT established by W. Kohn and collaborators and for which Kohn received the Nobel prize in chemistry in 1998.
Andreas taught the courses of Quantum Mechanics and Mathematics at the postgraduate School of Demokritos and at the Technical University of Athens from 1977 to 2014. He is the co-author of many books in English and the author of three books in Greek: The Mathematics of Quantum Mechanics (Athens, 2008 and 2010); Nuclear Weapons (Athens, 1984 and 1986); and Nuclear Power and Nuclear Radiation (Athens, 1986).
He was a member of the Joint European Torus Executive Committee (the European project for nuclear fusion) between 1991 and 1999. He was also the organizer of a number of conferences on physics and computational chemistry.