In 1985 he became a Lecturer .
In 1985 he later was elected Full Professor ( 1999 ) at the Physics Department in Aristotle University of Thessaloniki , while during 2005 - 2009 he served as Chairman in the same department .
In 1985 he became a Lecturer and later was elected Full Professor ( 1999 ) at the Physics Department in Aristotle University of Thessaloniki , while during 2005 - 2009 he served as Chairman in the same department .