Pleau joined the
New York Rangers as assistant general manager of player development in 1989, and was later promoted to assistant general manager and director of player personnel. He stayed with the Rangers for eight years, including the Rangers' Cup-winning season in
1993–94. He moved to the Blues in 1997 as general manager. The Rangers received winger
Mike Peluso from the Blues as compensation. While Pleau presided over the Blues' winning the
Presidents' Trophy in
1999–2000, the Blues steadily declined over the next few seasons, culminating in finishing dead last in the league in
2005–06, missing the playoffs for the first time in 25 years and for only the fourth time in franchise history. Following the season, the Blues were sold to
Dave Checketts. Pleau kept his job as general manager, but had to give most of his powers over hockey operations to
John Davidson. Pleau was also assistant general manager of the silver medal-winning American hockey team at the
2002 Winter Olympics, and was general manager of Team USA during the 2003 and 2004
IIHF World Championships and the 2004
World Cup of Hockey. Pleau stepped down as general manager of the St Louis Blues on July 1, 2010, with
Doug Armstrong taking his place. Pleau was then named senior advisor to hockey operations, and vice president, with the Blues after 13 years as the club's general manager, the longest tenure in franchise history. ==Awards and achievements==