Van Nispen studied Dutch law at
Tilburg University between 2000 and 2004. He then joined a law firm and did a master's degree in international and European public law between 2006 and 2007. Since then he worked for the Socialist Party group in the House of Representatives, occupying himself with the topic of Justice. Starting from his
2023 re-election to the House, Van Nispen was the Socialist Party's spokesperson for justice, safety, migration, governance, and sports. In February 2024, a
motion by Michiel van Nispen and
Mohammed Mohandis (
GL-PvdA) was carried to reintroduce swimming lessons in elementary schools. They called on the government to prepare scenarios for their initiative in response to declining swimming skills among youths. In May, the House passed another motion by Van Nispen to ban
international adoptions, which he called harmful to children. New applications were halted by the cabinet the following months, and it was later announced that no adoptions would be allowed starting in 2030. Along with
Mirjam Bikker (
CU), Van Nispen announced a bill with several measures to tackle
online gambling issues, including a ban on advertisements and credit card payments and increased contributions from operators toward addiction prevention. His party favored prohibiting online gambling, which had been legalized in 2021, but such a proposal was unlikely to pass the House. The House passed a motion by Van Nispen and
Sandra Palmen (
NSC) urging the government to adopt recommendations by
Jos Silvis to seek legal advice from a range of law firms. Previously, the government had relied almost exclusively on the firm . He did not run for
re-election in 2025, and his term ended on 11 November 2025. ==Electoral history==