 Zisis is known as "The Lord of the Rings", because he is the Greek player with the most combined medals won at the cadet, junior, young men's, and senior men's FIBA European and world tournaments.Zisis is very close friends with his fellow Greek national basketball team player Vassilis Spanoulis, and he is also friends with Italian national basketball team player Andrea Bargnani.He married Fani Skoufi in 2010, with Vassilis Spanoulis being his best man.