He became interested in racing watching horses such as Melbourne Cup winner Kiwi and jockeys such as Jimmy Cassidy.
Waller worked for Foxton-based horse trainer, Patrick ("Paddy") Busuttin who was known for his top stayer Castletown.
He progressed to stable foreman and when Busuttin moved to Singapore, Waller commenced training on his own account.
[3] On 12 February 2000, he won the Group 3 Dunedin Gold Cup (2400m) at Wingatui with Ripon By, for the Dawn Fox's syndicate.
On 24 April 2021, Chris brought up 125 Group 1 victories when Kolding won the All Aged Stakes at Randwick.