Olof van Joolen conducted an in-depth investigation into cybersecurity threats facing the Netherlands. His reporting highlighted vulnerabilities in critical infrastructure and prompted discussions on national security policies.

In 2020, Olof van Joolen launched a podcast series focusing on defense and security issues. The podcast features interviews with experts and insiders, providing listeners with in-depth analysis of current military affairs.

Olof van Joolen exposed a major corruption scandal involving defense contracts in the Netherlands. His investigative work led to significant policy changes and heightened scrutiny over military procurement practices.

In 2015, Olof van Joolen was awarded the prestigious De Tegel award for his investigative journalism work. His reporting on defense issues was recognized for its depth, accuracy, and impact on public discourse.

Olof van Joolen published a comprehensive book detailing the inner workings of the Dutch military, drawing on his extensive research and reporting. The book was well-received and further solidified his reputation as an expert in defense journalism.

In 2005, Olof van Joolen broke a major story on the Dutch military's procurement processes, revealing significant inefficiencies and mismanagement. This investigation brought him national recognition and established him as a leading journalist in military affairs.

Olof van Joolen began his career at De Telegraaf, one of the leading newspapers in the Netherlands. His early work focused on general news reporting, where he quickly made a name for himself with his thorough and insightful articles.