Size and mobility helped Dumoulin become a college champion and Stanley Cup champion.
A second-round draft pick (No. 51) of the Carolina Hurricanes in the 2009 NHL Draft, Dumoulin went on to a decorated collegiate career at Boston College, which included an NCAA championship in 2010 and 2012. During his time with the Eagles, Dumoulin was twice named an All-American (2011, 2012), twice named All-Hockey East (2011, 2012) and made the 2009 Hockey East All-Rookie Team.
In 2012, Dumoulin was a finalist for the Hobey Baker Award, given to the top player in college hockey. He was named to the 2010 and 2012 NCAA all-tournament teams.
After signing his entry-level contract with Carolina on April 10, 2012, Dumoulin was traded to Pittsburgh on June 22, 2012, with the No. 8 pick in that year's draft and forward Brandon Sutter for center Jordan Staal.
The 6-foot-4, 207-pound defenseman spent the next three seasons honing his game in the American Hockey League with Wilkes-Barre/Scranton, appearing in 14 regular-season games with the Penguins between 2012 and 2015 and five playoff games with Pittsburgh in 2015.
It wasn't until the 2015-16 season that Dumoulin earned a full-time role in the NHL, and he played a prominent role in the Penguins' championship run. In the playoffs, Dumoulin averaged more than 21 minutes per game, more than 2:30 over his regular-season average. Dumoulin scored his first NHL playoff goal in Game 5 of the Eastern Conference Final against the Tampa Bay Lightning, the same team he scored his first NHL goal against on Dec. 15, 2014.
Dumoulin also scored the opening goal in the clinching Game 6 of the 2016 Stanley Cup Final against the San Jose Sharks. With the victory, Dumoulin became the first native of Maine -- he hails from Biddeford -- to win the Stanley Cup.
Dumoulin, who played in 24 games in the 2016 playoffs, played 25 postseason games in 2017 when the Penguins won a second straight Stanley Cup.
Traded to Pittsburgh by Carolina with Brandon Sutter and Carolina's 1st round pick (Derrick Pouliot) in 2012 NHL Draft for Jordan Staal, June 22, 2012.