Mullin, who served as an assistant coach for Team USA at the 2022 IIHF Under-18 Men’s World Championship where the U.S. brought home a silver medal and 2022 Five Nations Tournament where the U.S. finished second, is serving as an assistant coach for the U.S. Under-18 Men's Select Team for the first time.

The Philadelphia, Pennsylvania, native, who helped the USA Hockey National Team Development Program’s Under-17 team to the 2023 Clark Cup Playoffs, recently wrapped his third season as an assistant coach at the NTDP. Mullin also had stints as the Ohio AAA Blue Jackets director of player development and advancement, and as director of scouting for the NAHL's Chippewa Steel.

Mullin played five seasons of college hockey, including four (2011-15) at Miami University and one (2015-16) at Minnesota State University, before going on to play three years (2016-19) professionally with the ECHL’s Kalamazoo Wings. He also played for Team USA at the 2010 World Jr. A Challenge where he led the tournament in goals, including the game-winner in the championship game.