After his stint in Brussels, Sjoerd Klumpenaar returned to Het Parool in 2021. He resumed his focus on local and national issues, bringing his international experience to bear on his reporting. His return was marked by a series of impactful stories on urban development and policy.

In 2019, Sjoerd Klumpenaar was appointed as a foreign correspondent based in Brussels, Belgium. Covering EU politics and international affairs, he provided insightful analyses and reports on the complex dynamics of European governance and policy-making.

Sjoerd Klumpenaar launched an investigative podcast series in 2017, delving into complex stories with a narrative approach. The series gained a loyal following for its thorough research and engaging storytelling, further establishing Klumpenaar's versatility as a journalist.

In 2015, Sjoerd Klumpenaar was awarded the prestigious De Tegel award for his investigative reporting on corruption within local government. His work uncovered significant misconduct, leading to policy changes and increased transparency in municipal operations.

Sjoerd Klumpenaar joined Het Parool, a prominent Amsterdam-based newspaper, where he continued to build his reputation as a leading journalist. At Het Parool, he focused on urban issues, cultural affairs, and local politics, contributing to the paper's strong local coverage.

In 2010, Sjoerd Klumpenaar published his first book, which explored the intricacies of Dutch politics and governance. The book was well-received for its thorough research and engaging narrative, establishing Klumpenaar as a knowledgeable voice in political journalism.

Sjoerd Klumpenaar began his career at NRC Handelsblad, one of the leading newspapers in the Netherlands. During his tenure, he honed his skills in investigative journalism, focusing on political and social issues. His work contributed to the paper's reputation for in-depth and analytical reporting.