 During his professional career he has represented the Super 14 side the Crusaders between 2002–04 when the side won the Super 12 title after an unbeaten season and the New Zealand Maori on their tour of England in 2003.Maddock was born in Christchurch, New Zealand and represented the Prebbleton club in his younger years.He made his professional debut for the province Canterbury in 2001, scoring two tries against Buller in a Ranfurly Shield match.