Giannis Dalezios was born in Athens In 1969. He is a graduate of the Business Administration of Piraeus University. He also manages a company that deals with the isnurance consulting services. In 1997 he founded the ''Religious Scientists (=Θρησκευόμενοι Επιστήμονες)'' and as he was the Head of this organization, was elected a member of the Board of Directors of Olympiacos in 2005. Since then, he has been a member of the Administration.He has been awarded the title of Honorary General Secretary by the General Assembly. Since December 2016, he has been serving the club as the General Manager.