He was educated at Musselburgh Grammar School.
He was a former Ryder Cup referee. He joined Ben Sayers as an apprentice golf club maker before becoming assistant to Bill Shankland at Potters Bar. He was the professional at East Hertfordshire and Dunham Forest.
Foreign 12 years, he was the professional at Ashridge Golf Club between 1964 and 1976.
In 1977 he became professional and then the managing director of the Woburn Golf Club in England. He was a professional golfer until 1994 and commentated for the British Broadcasting Corporation between 1978 and 2004.
Hay also provided commentary with Alliss in the Actua Golf video game series, capturing the charm of their television commentary. Although Hay retired from broadcasting, he remained involved in the professional golf scene.
He was noted for his golfing instruction, particularly the techniques of the swing.
He wrote numerous works on the subject. Hay died on the 11 July 2011, following a short battle with an illness. He was aged 78.