As an amateur, Henry won the 1988 Scottish Amateur Championship and reached the Semi-Finals of the World Amateur Championship in the same year. Turning professional in 1991, Henry won 51 of his first 62 career matches and rose to a ranking position of 39 within three seasons. Spending 13 consecutive seasons within the World's top 48 players, Henry enjoyed his best form around the turn of the century, reaching three ranking event semi-finals, including the
2002 UK Championship, where he defeated
Ronnie O'Sullivan 9-6 in the Quarter-Final. He was then defeated by Doherty in their sem-final match. Henry achieved his best ranking of 18 for the 2001/2002 season, having narrowly missed a top 16 spot at the end of the season. He spent five consecutive seasons within the World's top 32 players. Henry was also victorious in the 1991 Pontins Professional, defeating John Read in the final and won the 1995 WPBSA Minor Tour Event 6 in Beijing, defeating
Mark Williams 6-5. In 2002 Henry also defeated
Ali Carter 5-3 to win the
Scottish Masters Qualifying Event. In 1996 Henry narrowly missed out on a place in the Masters when he lost in a deciding frame 8-9 to
Brian Morgan in the Final of the
Benson & Hedges Championship. He also lost to
Dominic Dale in the final of the
Malaysian Masters in the same year. One of Scotland's leading players through the 1990s and 2000s, Henry also appeared at the Crucible Theatre for the
World Snooker Championships on six occasions, losing a number of close matches to leading players such as Mark Williams, Ronnie O'Sullivan,
Stephen Hendry and
John Parrott. He made his debut at the crucible in 1994 losing 9-10 to John Parrott and his final appearance in 2005 losing by the same scoreline to
Alan McManus, with his best runs being to the last 16 in 2000 and 2003. After 17 seasons as a pro, Henry lost his professional status in 2008 after dropping out of the World's top 64 players following a poor run of results. Henry completely retired from the game and has since made no attempt to regain his professional status. == Performance and rankings timeline ==