He was a close relative of political leader and former Turkish prime minister Adnan Menderes. He elected three times as member of national parliament from Democratic Party. In 1957 he was elected as Galatasaray President until 1959. Although there was no national football league established in Turkey in 1950's, Galatasaray won an Istanbul League title, while Giz was the president. He died in 1979.
| President of Galatasaray SK
11 Jan 1957 – 2 Jan 1960