Peter's journey in league football began in 1962 with South Adelaide while he was still a schoolboy attending Prince Alfred College.

Recognized as one of South Australia’s greatest footballers, Peter played a pivotal role in South Adelaide's 1964 premiership victory. Known for his reliable marking, robust physicality, and tireless stamina, these attributes defined his performance both in the premiership game and throughout his illustrious career.

Despite facing severe cartilage issues in 1965, Peter demonstrated remarkable resilience, ultimately completing 206 league games and representing South Australia in 13 state matches before retiring in 1974.

Peter served as South Adelaide's captain-coach from 1967 to 1969 and returned as captain in 1971. In 1974, he showcased his versatility by leading the club’s goalkicking. He also captained the South Australian state team in 1968 and 1970, earning All-Australian honors in 1969. A fierce competitor, Peter was runner-up for the Magarey Medal in 1964 and tied with Barrie Robran in 1968, though he was ineligible due to a suspension for an on-field altercation.

Highly sought after by powerhouse clubs like Fitzroy, Hawthorn, Geelong, and Richmond, Peter chose unwavering loyalty to South Adelaide. His dedication is epitomized by his record seven Knuckey Cup wins and his decision to donate these trophies back to the club.

Peter’s legacy stands as a testament to his enduring impact on South Australian football.