Montgomery has had a good deal of coaching success. He was 118-45-21 in three seasons with Dubuque of the United States Hockey League, which won the Clark Cup in 2011 and 2013. At Denver, he was 125-57 with 26 ties from 2013-18 and was named Spencer Penrose national coach of the year in 2017, when the Pioneers won the national title.
Boston Bruins forward Danton Heinen played for Montgomery at Denver from 2014-16.
"He was, for sure, definitely very detail-oriented and smart, systems-wise," said Heinen, who had 93 points (36 goals, 57 assists) in two seasons at Denver. "He always found a way to get the best out of his players and be peaking near the end of the year. He's a pretty good coach, to me."
As a former player -- Montgomery played 122 NHL games with the Blues, Montreal Canadiens, Philadelphia Flyers, San Jose Sharks and Stars -- he said communication is critical and that he usually initiates the conversations with players.
"When they're going good there are reminders of why they're going good," Montgomery said. "When they're going bad it's because of whatever those things they're doing that's causing them to get frustrated and/or lose confidence. That's when we go to them. What takes time is getting to know the personalities on your team. Some like one-on-one communication, some like to just talk while you're skating around the ice before practice or pregame skate. Some like to be brought in often, because they prefer a lot of communication."
Carle said Montgomery reads people fast.
"It doesn't take him three months to get to know what makes someone tick; it may take one conversation," Carle said. "His ability to read situations, read a room, is incredible."
How much Montgomery can achieve with the Stars, especially during the Stanley Cup Playoffs this season, remains to be seen. But he's off to an excellent start.
"You always hate to get too excited, because you know everyone else will get better, too. But it's nice for everyone in the organization to be in the spot we are," Barnes said. "Just to get into the playoffs was a big deal. Now being here in the second round, who knows what happens in the next little while. Guys have been good at staying in the present and not getting ahead of it, as has [Montgomery], so it's been enjoyable that way."
NHL.com staff writer Amalie Benjamin contributed to this report