[1] Gendron previously served as head coach for the Albany River Rats and Indiana Ice and held multiple positions for the New Jersey Devils, Albany River Rats, University of Maine, University of Massachusetts, Yale University, and Team USA Gendron's first coaching position was as assistant coach to Albie Brodeur for two seasons, from 1979-1981 at his alma mater, Berlin High School in Berlin, New Hampshire.
In his third season as an assistant at Maine, Gendron helped guide the Black Bears to the 1993 NCAA Division I Men's Ice Hockey Championship and an overall record of 42–1–2.
That season the Devils would go on to defeat the Detroit Red Wings to capture the team's first Stanley Cup championship.
During Gendron's tenure as a member of the New Jersey Devils organization the team won three Stanley Cup Championships 1995, 2000, 2003 and finished runner-up in 2001.
[4] In July 2005 Gendron was hired by Don "Toot" Cahoon to serve as assistant coach for the University of Massachusetts men's hockey team,[5] a position he held for six seasons.
While at UMass, he helped the Minutemen reach the 2007 NCAA Division I Men's Ice Hockey Tournament where they eventually lost in the regional final to the University of Maine.
[7] In his second season as an associate head coach of the Bulldogs, Gendron helped guide the team to the first national championship in school history in 2013.