[2] A tall, correct left-handed batsmen, Cowper scored heavily for Victoria in the 1962–63 and 1963–64 seasons and was selected to tour England in 1964.
[2] He took part in Australia's next tour, to the West Indies in 1964-65, when he "displayed courage, a cool temperament and fine technique in dealing with the hostile pace of Hall and Griffith".
[2] He captained Victoria to victory in the Sheffield Shield in 1969–70, then left cricket altogether to concentrate on his business career.
[5] Since retiring from playing, Cowper has had a successful career in big business, and has also served as a cricket referee.
[10] In the 2023 King's Birthday Honours he was awarded the Medal of the Order of Australia in recognition for his service to cricket.