Distinguished Lecturer Series - Leon The Mathematician is a lecture series established by the Department of Informatics, Aristotle University of Thessaloniki, with the support of Graduate Programme of the department. The Lecturer Series presents computing scientists and scholars, who play an influential role in the academia and industry. The lectures take place at the Auditorium of the Central Library of the Aristotle University of Thessaloniki unless otherwise noted. They are free of charge and open to the public.