William spent 12 years living and training in Europe in a quest to find the best table tennis practice and coaching available. From the age of 14 years, he played with World and Olympic Champions, and worked with many of the top coaches in the world.

He relocated back to Australia in 2008 after a successful Beijing Olympic Games campaign where he defeated former European Champion, Jens Lunqvist, from Sweden and pushed triple World Singles Champion Wang Li Qin of China in front of millions of TV viewers. William rates his silver medal at the 2006 Commonwealth Games as a career highlight.

William holds many records in Australian table tennis; he is a 12-time Australian Singles Champion, has represented his country at 3 Olympic Games and 3 Commonwealth Games and was inducted into the Australian Table Tennis Hall of Fame at the age of 26.

Henzell's trademark shots are his backhand topspin and tomahawk serve. He is regarded as one of the more technical and tactical players on the World circuit, often using spin, placement and variation to outmaneuver his opponent.