Whilst attending King's, Denham played cricket and hit 100 runs against Shirley Boys in 1982,[2] and won the Salter Trophy,[3] which is awarded to the school's sportsman of the year.
Denham attended Otago University in 1982, where he met his future wife and graduated with a Bachelor of Teaching.
[4] Denham made his NBL debut in 1986 for the Waikato Pistons, later moving to play for the Canterbury Rams, winning championships in 1989 and 1990.
He played in the 1986 FIBA World Championship,[6] where New Zealand placed 13th, with Denham averaging seven points per game.
[8] In early April 2024, Denham was appointed by Associate Education Minister David Seymour to an eight-member Charter School Establishment Board tasked with facilitating the reintroduction of charter schools in New Zealand.