Bergen entered the race for Assembly after incumbent Republican Michael Patrick Carroll announced that he would run for Morris County Surrogate. In the June 2019 Republican primary, Bergen and Anthony M. Bucco won the nomination for the two Assembly seats in the 25th district.[5] After the death of state senator Anthony R. Bucco in September 2019, his son was appointed to fill the senate seat and Aura K. Dunn was appointed to fill the vacant Assembly seat.
In the November 2021 general election, Bergen and his Republican running mate Aura K. Dunn defeated Democratic Party challengers Lauren Barnett and Patricia Veres.[6]
^"Duty, Honor, Country, Still Prevalent for West Point Grad Turned Denville Councilman", My Life Publications, May 7, 2019. Accessed January 14, 2021. "New Jersey native Brian Bergen was a standout on the cross-country team at James Caldwell High School when he attracted the interest of a recruiter at the United States Military Academy at West Point."
^Biryukov, Nikita. "Bergen, Bucco win in LD25; Denville Councilman defeats former Frelinghuysen aide", New Jersey Globe, June 4, 2019. Accessed May 9, 2022. "Assemblyman Tony Bucco and Denville Councilman [Brian Bergen] have won the Republican nod in the 25th legislative district, defeating Aura Dunn, an aide to former Rep. Rodney Frelinghuysen, and attorney John Barbarula."
^Election 2023: Legislative District 25, NJ Spotlight News, May 5, 2023. Accessed January 24, 2024. "The current Assembly members, both Republicans, are Brian Bergen and Aura Dunn, the assistant Republican whip who before assuming office had a longtime career in government and public affairs. Dunn is running for reelection with Assemblyman Christian Barranco, who currently represents the neighboring 26th District, but whose hometown of West Milford was moved into 25th. Bergen’s hometown was moved into the 26th and he is running there."
