His mother is Milou Mackenzie, who is a Lehigh Valley-area Republican state representative for the 131st district. They were the first mother-son pair to simultaneously serve in the Pennsylvania House of Representatives.[5]
In 2012, Mackenzie was elected to represent District 134 in the Pennsylvania House of Representatives. After redistricting, he ran for and won the District 187 seat in 2022.
During the 2023-24 legislative session, Mackenzie was the Republican chair of the Labor and Industry Committee. He also served as co-chair of the International Relations Caucus.[10] Mackenzie previously served as majority chair of the House Government Oversight Committee, deputy majority whip, deputy chair of the House Majority Policy Committee, vice chair of the House Labor and Industry Committee, chair of the Financial Services and Banking Subcommittee with the House Commerce Committee, and chair of the Workforce Development Subcommittee with the Economic Recovery Task Force.[11] He has said that his top priorities include "creating jobs, protecting taxpayers, strengthening education, and reforming government".[12]
In 2021, Mackenzie briefly ran for the Republican nomination for Pennsylvania's 7th congressional district.[15] He withdrew from the race, instead opting to run for reelection to the Pennsylvania House of Representatives.[16]
In July 2023, Mackenzie again announced his candidacy for Pennsylvania's 7th congressional district, this time for the 2024 election.[17] During his campaign, he called the issue of immigration a "top priority." Mackenzie also voiced support for the Gaza war, but opposed further aid to Ukraine amid the continuing Russian invasion.[18]
On April 23, 2024, Mackenzie won the Republican nomination for the seat, defeating Kevin Dellicker (who also ran in 2022) and Maria Montero.[19] In the general election, Mackenzie defeated incumbent Democrat Susan Wild.[6]
Tenure
Mackenzie was sworn in to the 119th Congress on January 3, 2025.
