Craig Thomson has retired after 19 years as one of Scotland's leading referees.
Celtic's win against Hearts last Saturday was his final game after a total of 31 years as an official.
Domestically, Thomson officiated three Scottish Cup finals and four League Cup finals.
"I've enjoyed 19 years as a Category one referee," the 46-year-old told BBC Scotland.
"It's time to let younger refs come through and maybe see if I can reduce my golf handicap."
Thomson was also an elite FIFA official, taking charge of Champions League and international matches, including at the European Championships in 2012.