Dennis started to play snooker at 9 years of age in his home town, Coalisland, Northern Ireland. He moved to England at the age of 17 to work – not play snooker.
By the age of 14 he was the best billiards and snooker player in his local area. He won the British Junior Billiards title in the 1967/68 season and turned professional in 1971/72 season.
The big turning point in his career came when he paid his own way to go to Canada to compete in the Canadian Open in 1974. He beat Alex Higgins to get through final – only to lose to Cliff Thornburn.
He was TV Times Sports Personality of the year in 1985, he also won more than 10 Sports Personalities of the Year in 1985.
One of the nicest people on the circuit, Dennis is available for after dinner speaking and golf days.