[1] He was raised by Craig and Kim Hartman in West Dundee, Illinois, where he became a fan of the Chicago Blackhawks of the National Hockey League (NHL).

[4] When he was 15, Hartman joined the USA Hockey National Team Development Program (NTDP), and his family moved to Ann Arbor, Michigan.

[10] Hartman was rated as a top prospect, fulfilling the expectation to be a first-round selection at the 2013 NHL entry draft.

The team sought to harness Hartman's physical play style after trading away Andrew Shaw in the offseason.

[21] The NHL suspended Hartman for one game during the first round of the 2018 Stanley Cup playoffs after he delivered an illegal check to Carl Soderberg.

On June 24, 2019, Hartman was again involved in a trade, dealt by the Flyers to the Dallas Stars in exchange for Tyler Pitlick.

[25] On the opening day of free agency, Hartman was signed to a two-year, $3.8 million contract with the Minnesota Wild on July 1, 2019.

[28] Hartman sparked controversy in late December 2023 after being accused of intentionally attempting to injure a player in a back-to-back series against the Winnipeg Jets.

[29] On December 30, Wild star Kirill Kaprizov was injured from a pair of cross-checks from Jets defenceman Brenden Dillon.

[30] Although the play was not called a penalty by the referees, Perfertti was wearing a microphone when the exchange occurred which picked up audio of the interaction.

[31] On January 2, 2024, the NHL fined Hartman $4,427.08 for high-sticking Perfetti, the maximum allowable under the league's collective bargaining agreement for an infraction which does not involve an injury or game misconduct penalty resulting from a play.

[31][32] After three days of silence following the breaking of the story, Hartman publicly denied that he had intentionally high-sticked Perfetti and instead claimed that Perfetti had baited Hartman into claiming responsibility for the incident during the match; audio of the exchange was not released after the Wild organization and National Hockey League Players' Association objected to its release.