On the international front, he represented the league in any dealings with European countries. This became a exceedingly more complex task with the influx of players to the NHL from Europe.
O'Neill also presided over the league's Supplementary, Waiver and Expansion Drafts and was a member of several NHL Committees including the General Managers, Rules, Professional and Officiating. He recorded the minutes at the NHL Board of Governors meetings, was the league supervisor of the Stanley Cup playoffs and sat on the Hockey Hall of Fame Board of Governors.
On Sept. 30, 1992, O'Neill stepped down as NHL Executive Vice-President to serve as a consultant. His new role included administering the NHL Emergency Assistance Fund and working towards the standardization of equipment for the league. O'Neill continued to be a Trustee of the Stanley Cup, an honoured given to him in 1988.
He was inducted into the Hockey Hall of Fame in 1994.