 On 7 December 1990, he was appointed as a judge of the Constitutional Court by Turgut Özal, then President of the Republic of Turkey.On 7 December 1999 and 7 December 2003, he was elected twice as the deputy president of the court.On February 10, 2015, he announced his retirement, a month ahead of schedule, after a series of public confrontations between himself and top government officials.