[1] Previously, he was a member of the North Rhine-Westphalia state parliament from 2010 to 2021.

He worked for Schieder Möbel for 26 years until the company's insolvency.

[3][4] Berghahn has been a member of the Blomberg town council and local chairman of Istrup since 2004.

He has been the chairman of the Blomberg real estate and property management since 2004.

[12] In 2024, Berhahn announced that he isn't seeking re-election to the Bundestag in the 2025 German federal election.