It's no secret that Brad Stevens of the Boston Celtics is a great coach. But NBA GMs believe that he is the best coach in the NBA according to John Schuhmann of NBA.com.

Every year, NBA.com releases its GM survey and this year, Brad Stevens received 47 percent of the vote asking who is the best head coach in the NBA. Gregg Popovich finished second 30 percent of the vote. Mike D'Antoni and Steve Kerr each received seven percent of the vote. Rick Carlisle, Quin Snyder, and Terry Stotts all received votes as well.

The Celtics playoff run showcased Stevens' coaching chops. He helped navigate Boston to Game 7 of the Eastern Conference Finals despite the absences of Gordon Hayward and Kyrie Irving due to injury. Stevens consistently gets the most out of his players and the team's playoff run highlighted his exceptional ability as a tactician.

To put this in perspective, in the last three years, Popovich received 82, 83, a whopping 93.1 percent of the votes for the best head coach in the league. Either Stevens' unlikely playoff run really swayed GMs or Popovich's falling out with Kawhi Leonard really hurt him this season. It's likely a little bit of both.

This survey shows just how quickly Stevens has risen in the coaching ranks. He was once a little-known coach of Butler University, a small Indiana school that went on an unlikely run to the National Championship. Now he's one of the most respected coaches in the NBA with a super talented Celtics roster at his disposal.