Mark MacKenzie is a Democratic member of the New Hampshire House of Representatives, representing Hillsborough District 40 since December 2022. He joined the Manchester, New Hampshire fire department at age 21 and served for 25 years. He served as president of the New Hampshire chapter of the AFL–CIO from 1989 to 2015, and in 2018 ran unsuccessfully in the Democratic primary for New Hampshire's 1st congressional district, finishing eighth of eleven candidates.