From the Randwick club, Whittaker also played for Wellington a record 73 times. He played in 73 games for Wellington. Whittaker was involved in Randwick's premierships in 1968, 1969, 1970, 1976 and 1983.
Whittaker made his international début for the New Zealand Kiwis in 1970 and went on to play for the Kiwis in twenty four matches, including four world cups. Whittaker's international career spanned thirteen seasons. Despite suffering major injuries in a motoring accident, Whittaker made a full recovery and was recalled in the early 1980s after two years out of the national side.