Ainslie Sheil was born in 1933 and entered The Southport School in 1947 as a member of Delpratt House. During his time at the School he was an accomplished scholar and sportsman, winning Dux of the School, the Chelmsford Cup and the Founder's Prize. Ross was also a School Prefect, House Captain, member of the 1st XV Rugby, 1st XI Cricket, 1st IV Tennis, as well as being a member of the School's Swimming and Athletics teams.
Following his graduation from The Southport School in 1950, Ross began his medical degree at the University of Queensland, where he continued to build upon his already accomplished sporting profile. As a member of St. John's College, he represented the College in Cricket, Rugby, Athletics, Swimming, Tennis and Rowing. He was awarded a College Blue in 1951 in recognition of his outstanding contribution. As well as representing St. John's College, Ross also represented the University of Queensland in Rugby Union at a time when the University of Queensland won the Premiership six times during the seven-year period from 1952 – 1957.
Ross also represented the University in Athletics and Tennis for which he was awarded a University Blue in 1952. Whilst continuing his studies, Ross was also a member of the Queensland XV from 1952 – 1957. He was selected for the Australian Universities XV which played New Zealand in 1954, Japan in 1956 and the Australian Barbarian XV in 1957. His one and only National cap came in 1956 when he was selected for Australia against South Africa in Sydney. He acquitted himself well, however dislocated his shoulder and so was unavailable for the second test.
Following the 1957 season, Ross was awarded a Rhodes scholarship to Balliol College, Oxford University, where he continued his studies in Medicine. While at University, Ross continued to pursue his passion for both rugby and tennis and was awarded a Full Blue for both in 1958.