Themis lived in Paris during the years 1977 to 1987 where he studied law at the University of Paris X, majoring in Commercial Law. After completing his studies, he worked in Paris as a legal consultant.

Themis returned to Greece in 1988 where he took over his father’s practice, a well known law firm in the centre of Athens.

Themis is a consultant to a number of multinational companies and is a member of the Greek-French Chamber of Commerce.