After graduating from Boston University in 1991, Ed signed on with the team that drafted him out of high school, the Montreal Canadians. During his second pro year, 1993, he helped the Canadians defeat Wayne Gretzky and the Los Angeles Kings in the Stanley Cup Finals. In 1995 he moved on to play with the Winnipeg Jets and, in 1996, joined the Buffalo Sabres.
As a high school player at Andover Academy, Ed Ronan was a standout forward who was picked up in the NHL Draft albeit well down the line by the Montreal Canadiens in 1987.
After learning the pro game in 1991-92 with the Habs farm team in Fredericton, New Brunswick, Ronan earned a role on the 1992-93 Montreal Canadiens. He was a solid third or fourth line winger whose job was to shut down opposing players rather than score goals. He did a good job, and in the 1993 playoffs helped the Habs defeat Wayne Gretzky and the Los Angeles Kings to capture the team's 24th Stanley Cup championship.
By 1993-94, Ronan had established himself as a respectable defensive forward, and as a result played in the NHL all season long. However injuries depleted his 1994-95 season, and he found himself on waivers and picked up by the Winnipeg Jets.
In Manitoba, however, Ronan never got much ice time during his 17 games with the club. Instead he spent most of the 1995-96 campaign with the Springfield Falcons of the AHL.
Ronan was again placed on waivers and this time was claimed by the Buffalo Sabres. He would play 18 less than spectacular games with the Sabres before being sent down to toil with the Rochester Americans. Near the end of the 1996-97 campaign he was called up to join the Sabres ahead of the playoffs. His six games of post-season play were his last in the NHL.
Ed Ronan was an industrious winger who carved out a nice sever year professional hockey career. He became a financial adviser in the Boston area after hanging up his skates.