"Bruce brings a wealth of experience," said assistant GM Don Sweeney. "National Hockey League level, American Hockey League level. He brings insight. He's traveled a course to get back to where he is right now. He's hungry for the opportunity again. He's done a really good job of developing players at all levels. He's worked with forwards and defense. The last couple years, we've seen a nice impact he's had on our players."
The 46-year-old Cassidy was Washington's top man in 2002-03. Cassidy was fired in 2003-04 and replaced by assistant coach Glen Hanlon. Cassidy led Washington to a 47-45-9-6 record.
Cassidy was hired by Chicago to be an assistant coach. Cassidy worked with Norfolk, Chicago's AHL affiliate, during the 2004-05 lockout year. In 2006-07, Kingston of the OHL hired Cassidy as its head coach. Cassidy was fired in 2007-08.
During the playoffs, Cassidy traveled with the Bruins and led the Black Aces' on-ice sessions. The Bruins have not hired Cassidy's assistant.