In 2022, Harm Taselaar moderated a high-profile national election debate, showcasing his skills as a seasoned journalist and his ability to facilitate important political discussions. The debate was broadcast live and attracted a large viewership, highlighting its significance in the electoral process.

In 2020, Harm Taselaar spearheaded the launch of RTL Nieuws' podcast series, aiming to reach a younger audience and adapt to the growing trend of digital audio content. The series covers a wide range of topics, from politics to culture, and has been well-received by listeners.

In 2018, Harm Taselaar and his team at RTL Nieuws were awarded De Tegel, the most prestigious journalism award in the Netherlands, for their investigative reporting on a major political scandal. The award recognized their commitment to uncovering the truth and holding power to account.

Harm Taselaar played a pivotal role in leading RTL Nieuws' coverage of the MH17 disaster in 2014. His newsroom's comprehensive reporting on the tragedy and its aftermath was widely recognized for its depth and sensitivity, earning critical acclaim.

In 2010, Harm Taselaar was promoted to editor-in-chief of RTL Nieuws. Under his leadership, the newsroom expanded its digital presence and adapted to the rapidly changing media landscape, maintaining its position as a leading source of news in the Netherlands.

After five years in the United States, Harm Taselaar returned to the Netherlands in 2005 to take on a senior editorial role at RTL Nieuws. His experience abroad enriched his perspective, allowing him to contribute significantly to the newsroom's international coverage.

In 2000, Harm Taselaar was appointed as RTL Nieuws' foreign correspondent in the United States. Based in Washington D.C., he covered major events including the 2000 presidential election, providing Dutch audiences with in-depth analysis and reporting on American politics.

Harm Taselaar began his career at RTL Nieuws in 1995, marking the start of a long and influential tenure at one of the Netherlands' most prominent news organizations. His early work focused on domestic news, where he quickly established himself as a reliable and insightful journalist.