Eelco Koolhaas led an investigative series exposing political corruption in the Netherlands. The series was lauded for its depth and impact, leading to public discourse and policy changes. His work reinforced his reputation as a fearless investigative journalist.

After several years of working on various projects, Eelco Koolhaas returned to NOS Journaal. His return marked a new chapter in his career, where he continued to contribute to the newsroom with his extensive experience and journalistic acumen.

Eelco Koolhaas published a book exploring media ethics in the digital age. The book delves into the challenges journalists face in maintaining integrity and objectivity, offering insights and guidelines for both seasoned professionals and aspiring journalists.

Eelco Koolhaas received the prestigious De Tegel award for his investigative journalism work. His reporting uncovered significant political and economic issues, demonstrating his commitment to uncovering the truth and holding power to account.

Eelco Koolhaas produced a groundbreaking documentary on climate change, highlighting the urgent need for global action. The documentary was praised for its thorough research and compelling narrative, raising awareness and sparking discussions across the Netherlands.

Eelco Koolhaas was posted as a foreign correspondent in New York, USA. During this time, he covered major events such as the 2000 U.S. presidential election and the aftermath of the 9/11 attacks, providing Dutch audiences with critical insights into American politics and society.

Eelco Koolhaas began his career at NOS Journaal, one of the Netherlands' most prominent news organizations. His role involved covering national and international news, where he quickly established himself as a diligent and insightful reporter.