His travels to the Ahearne Cup in Europe led to him opening the door for European teams playing tournaments in North America, and his role as a Chef de Mission for these events.

Renwick was the founding chairman of the Wrigley Cup hockey tournament for midget age group in 1974, and then became vice-president of the CAHA in 1975.

During his time as president, the CAHA began the process of recognizing women's ice hockey in Canada, and implemented rules for mandatory safety equipment for youths.

He also served as the chairman of the IIHF committees for rules, by-laws and statutes, and helped negotiate National Hockey League involvement in the Winter Olympic Games.

[3] Renwick served as president of the Galt Hornets team from 1966 to 1973, which won two Allan Cups for the senior ice hockey championship of Canada.

[7] He served as the Chef de Mission for European club teams visiting North America during 1970s on exhibition tours.

[4][6][19] He also hosted an international senior hockey tournament in December 1972, involving his own Galt team, HC Dynamo Moscow from the Soviet Union, the Prague Selects from Czechoslovakia, Timrå IK from Sweden, and the Owen Sound Downtowners and Kingston Aces from Ontario.

When the annual meeting in 1977 approved $523,000 for development, Renwick stated that the CAHA needed about $5 million to fully implement what it envisioned.

In October, Renwick announced a workshop to determine the status of women's ice hockey in Canada, since the CAHA constitution restricted play to males.

[26] In March 1978, Renwick announced that by 1980, the CAHA would implement mandatory face masks on hockey helmets which met Canadian Standards Association (CSA) approval.

He was disappointed in the abilities of Doug Fisher as the chairman, and described Alan Eagleson as a dictator who wielded influence in the favour of professional players.

The CAHA's predicament worsened after a speech from the Minister of Amateur Sport, Iona Campagnolo, which confirmed Eagleson as Canada's sole negotiator for international competition.

Renwick reiterated that Fisher should be removed, and that Eagleson should focus solely on professional hockey since he showed no interest in amateur issues.

[39] Renwick was reelected by acclamation as CAHA president on May 25, 1978,[27] and as the non-European representative on the International Ice Hockey Federation (IIHF) council on July 7, 1978.

In October 1978, Renwick threatened to use the CAHA's leverage as an IIHF member, to block a series of WHA games versus international teams, unless the issue was resolved.

Renwick was tired of the constant questioning of the CAHA by federal and provincial governments, but he put together a committee to examine the report in more detail.

The CAHA eliminated body checking in age levels below pee-wee; it sought stricter enforcement of player safety rules including high-sticking, illegal hockey sticks, and body checking; and it made CSA approved helmets and face masks mandatory by March 1, 1980.

[4][13] The CAHA later extended the ban of body checking to include the pee-wee age group, which Renwick had previously implemented.

[4][6][7] As a board member in 1979, the IIHF followed his example in Canada, and required face masks on hockey helmets for players aged 16 and younger.

Renwick then asked IIHF members to endorse approved masks in their respective youth hockey associations.

[4][21] Renwick served as the chairman of the IIHF committees for rules, by-laws and statutes to implement uniformity of hockey in North America and Europe.

He reiterated concerns for consistency in global enforcement of rules, and excessive on-ice violence experienced in the CAHA that came with the improved safety equipment, and players feeling invincible.

[68] The German Ice Hockey Federation protested the shootout win by Team Canada in the 1992 Winter Olympics due to a referee error, but the game result was upheld by the IIHF, and Renwick stated that the previous goal counted once the puck had been put back into play.

[71] Renwick was cautious that lengthening the NHL season schedule to accommodate the Olympics would decrease the number of players available to participate in the Ice Hockey World Championships.

[1][2] He and his second wife Maggie were invited annually to attend the Ice Hockey World Championships,[7] and he was good friends with Vladislav Tretiak.

[82][83] He received the order on June 25, 2012, along with fellow honourees Jean Béliveau, Cassie Campbell, Wayne Gretzky and Gordie Howe.

[7][83] Other recognition for the Order of Hockey in Canada included a customized plaque from Cambridge City Council and its mayor Doug Craig,[84] and congratulations by Rob Leone in the Legislative Assembly of Ontario.

[85] Renwick was also made a life member of Hockey Canada,[4] and was inducted into the Waterloo Region Hall of Fame.