Henry has achieved major success in the sport winning two gold medals in the World Outdoor Bowls Championship and three Commonwealth Games medals.
In 1996 he won the gold in the pairs with Sammy Allen at the 1996 World Outdoor Bowls Championship in Adelaide. Four years later he won a second gold at the 2000 World Outdoor Bowls Championship in the singles in Johannesburg, South Africa.
In the Commonwealth Games he won the bronze medal Commonwealth Games in the singles in Kuala Lumpur in Malaysia and four years later won silver at the 2002 World Outdoor Bowls Championship in Manchester. Another silver medal in 2006 came in the triples event.
All of the medals were won representing a combined Ireland team or Northern Ireland (Commonwealth Games) before Henry emigrated to Australia where he resides and plays for Warilla and has been capped by Australia.
He has also won six outdoor Irish National Bowls Championships the 1996 and 2001 singles, the 1990, 1994 and 2003 pairs titles and the 1993 triples title. He has also won the singles at the British Isles Bowls Championships in 1997. In 2006, he won the Hong Kong International Bowls Classic singles title.
He won a 2004 World Outdoor Bowls Championship pairs title with Ian McClure and after emigrating most of his career has been revolved around indoor bowls. He has taken advantage of the fact that the World Cup Singles are held at his home club which had contributed in a record six title wins in 2012, 2013, 2014, 2016, 2017 and 2018.