He studied in Bulgaria, currently he is a university lecturer and a Director of Kykkos Monastery Research Centre.

The honorary insignia way awarded by Prof. Ivan Ilchev, Rector of Sofia University, at the presence of the Director of the Centre for Slavo-Byzantine Studies “Prof. Ivan Dujčev”, the academia, and professor's friends and colleagues.

Prof. Theoharidis' speech was on "Bulgarian - Cyprus relations through the ages". Prof. Theoharidis disclosed unknown facts about the relations between Bulgarians and Cypriots as a result of his work. The presentation was in Bulgarian.