O'Neill came to Holy Cross from Columbus, Ohio and soon established himself as an outstanding athlete. He was a key member of both the baseball and basketball teams at the college where he starred in both sports for three years.
In his senior year, the Holy Cross baseball team won the 1952 NCAA Championship at Omaha with O’Neill becoming the first pitcher to win three tournament games. He was selected MVP of that tournament and was named to the All-Star team. His record for three years was 17-6. During those three years, Holy Cross went 45-14-1.
O'Neill was also a member of three basketball teams coached by Buster Sheary that went 71-13. Each of those teams won 20 or more games. As a sophomore, O'Neill played on the 1949-1950 team which had Cousy and Oftring as co-captains. That group won 27 games, a school record shared by the NCAA Champions of 1946-1947. He passed away on March 3, 1993.