However , in the summer of 1979 , the Greek championship turned professional and Stavros Daifas became owner and president of the club .
Following Goulandris resignation from the presidency in 1975 , the team went through a relative dry spell in the second half of the 1970s .
In the summer of 1979 , the Greek championship turned professional and Stavros Daifas became owner and president of the club .
Following Goulandris resignation from the presidency in 1975 , the team went through a relative dry spell in the second half of the 1970s .