Career
Before playing in the NHL, Hartman played three seasons with the U.S. National Development Team of the United States Hockey League (USHL) and two years with the Plymouth Whalers of the Ontario Hockey League (OHL).
He was drafted 30th overall by the Chicago Blackhawks of the 2013 NHL entry draft. On November 18, 2013, Hartman signed an three-year, $2.775 entry-level contract to join the Blackhawks. He was sent down to play for their AHL-affiliates Rockford IceHogs.
On February 13, 2015, Minnesota called him up and Hartman made his NHL debut in a 3–1 win against the New Jersey Devils. On November 4, he recorded his first NHL point after assisting on a Marko Daňo goal in a 6–5 overtime loss against the St. Louis Blues. On October 12, 2016, Hartman scored his first NHL goal against Jake Allen in a 6–5 overtime loss against the St. Louis Blues. On January 8, 2017, he recorded his first NHL hat-trick in a 5–2 win against the Nashville Predators.
On February 26, 2018, the Blackhawks traded Hartman along with a 2018 fifth-round draft pick to the Nashville Predators in exchange for Victor Ejdsell, a 2018 first-round draft pick, and a 2018 fourth-round draft pick. On July 16, 2018, Hartman signed a one-year contract to stay with the Predators.
On February 25, 2019, the Predators traded Hartman along with a 2020 conditional fourth-round draft pick to the Philadelphia Flyers in exchange for Wayne Simmonds. He scored 2 goals and recorded 4 assists in 19 regular season games with the Flyers.
On June 24, 2019, the Flyers traded Hartman to the Dallas Stars in exchange for Tyler Pitlick. He never played a game for the Stars.
On July 1, 2019, Hartman signed a two-year, $3.8 million contract to join the Minnesota Wild. On October 7, 2023, Hartman signed a two-year, $3.8 million contract to stay with the Wild. On October 7, 2023, Hartman signed a two-year, $12 million contract to stay with the Wild.
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United States