The coaching carousel is a precarious ride at the best of times, and this season has already seen several NHL head coaches replaced.Five teams have parted ways with their bench bosses this season, but only three of those came as a direct result of poor play — allegations of physical and verbal abuse cost Bill Peters his job in Calgary and the Dallas Stars terminated Jim Montgomery’s contract under mysterious circumstances. On the flip side, Tampa Bay’s Jon Cooper is the longest-serving head coach in the NHL, having been with the Lightning since March 2013.TeamCoachPrevious coachBoston BruinsBruce CassidyClaude Julien (2007-17)Buffalo SabresRalph KruegerPhil Housley (2017-19)Carolina HurricanesRod Brind’AmourBill Peters (2014-18)Columbus Blue JacketsJohn TortorellaTodd Richards (2012-15)Detroit Red WingsJeff BlashillMike Babcock (2005-15)Florida PanthersJoel QuennevilleBob Boughner (2017-19)Montreal CanadiensClaude JulienMichel Therrien (2012-17)New Jersey DevilsAlain Nasreddine*John Hynes (2015-19)New York IslandersBarry TrotzDoug Weight (2017-18)New York RangersDavid QuinnAlain Vigneault (2013-18)Ottawa SenatorsD. J. SmithMarc Crawford* (2018)Philadelphia FlyersAlain VigneaultScott Gordon* (2018-19)Pittsburgh PenguinsMike SullivanMike Johnston (2014-15)Tampa Bay LightningJon CooperGuy Boucher (2010-13)Toronto Maple LeafsSheldon KeefeMike Babcock (2015-19)Washington CapitalsTodd ReirdenBarry Trotz (2014-18)Western ConferenceThe West has certainly been the more volatile of the two conferences from a head coaching perspective. Peters, Montgomery and DeBoer all left their former teams within a 12-day span.TeamCoachPrevious coachAnaheim DucksDallas EakinsRandy Carlyle (2016-19)Arizona CoyotesRick TocchetDave Tippett (2009-17)Calgary FlamesGeoff Ward*Bill Peters (2018-19)Chicago BlackhawksJeremy CollitonJoel Quenneville (2008-18)Colorado AvalancheJared BednarPatrick Roy (2013-16)Dallas StarsRick Bowness*Jim Montgomery (2018-19)Edmonton OilersDave TippettKen Hitchcock (2018-19)Los Angeles KingsTodd McLellanWillie Desjardins* (2018-19)Minnesota WildBruce BoudreauJohn Torchetti* (2016)Nashville PredatorsPeter LavioletteBarry Trotz (1998-2014)San Jose SharksBob Boughner*Peter DeBoer (2015-19)St. Louis BluesCraig BerubeMike Yeo (2017-18)Vancouver CanucksTravis GreenWillie Desjardins (2014-17)Vegas Golden KnightsGerard Gallant—Winnipeg JetsPaul MauriceClaude Noel (2011-14)* Denotes interim head coach Whatever the case, five coaching changes by early December is a substantial amount of movement.FIRED: Mike Babcock | Bill Peters | John Hynes | Jim Montgomery | Peter DeBoerKeeping track of all 31 current NHL head coaches is a tough task, but Sporting News is up to the challenge. Listed below is each team’s current bench boss, plus their predecessors.Eastern ConferenceTwo of the five coaching changes have come from the East, although Babcock’s split from the Toronto Maple Leafs on November 20 got the proverbial ball rolling for the rest of the league.