For his contributions to democracy, to geological sciences, and to linguistics he was pronounced honorary Doctor of Philosophy of the University of Patras (Department of Geology) in 1996, of the Aristotle University of Thessaloniki (Department of Civil Engineering) in 2001, of the National Technical University of Athens (School of Mining & Metallurgical Engineering) in 2003, and of the National and Kapodistrian University of Athens (School of Philosophy) in 2008.