Warwick has worked as a full time artist since the early 1970s. For 25 years he was a partner in Fingers, the influential Auckland gallery for contemporary jewellery and a prime driver behind the establishment of Objectspace, Auckland's centre for contemporary craft and design of which he is Founding Chair.
He was named an Arts Foundation Laureate in 2002 and his international standing was recognised by the Françoise van den Bosch Foundation in Amsterdam who made him a Laureate in the same year. He regularly exhibits in New Zealand, Australia, Europe and the USA. His works are held in National and International collections. Recently he was awarded the Barvarian State Prize for his exhibition work in Germany.