In 2022, Xantha Leerssen was selected to moderate a high-stakes national election debate, showcasing her skills in facilitating critical discussions and her deep understanding of the political landscape. Her moderation was praised for its fairness and ability to draw out substantive responses from the candidates.

During the COVID-19 pandemic, Xantha Leerssen was at the forefront of NOS's coverage, providing critical updates and analyses on the impact of the virus in the Netherlands. Her reporting was instrumental in keeping the public informed during a time of crisis, highlighting her commitment to public service journalism.

Xantha Leerssen published a critically acclaimed book exploring the intricacies of Dutch politics and governance. The book provided an insider's view of the political landscape, drawing on her extensive experience and insights gained from years of reporting on political affairs.

In 2017, Xantha Leerssen was awarded the prestigious De Tegel award for her investigative reporting on the misuse of public funds in a high-profile government project. Her work was praised for its depth, accuracy, and impact, cementing her status as a leading investigative journalist in the Netherlands.

Xantha Leerssen joined NOS, the leading public broadcaster in the Netherlands, where she further established herself as a key figure in Dutch journalism. Her role at NOS allowed her to expand her coverage to include national and international news, particularly focusing on political affairs.

In 2013, Xantha Leerssen played a key role in covering a major political scandal involving corruption at the municipal level. Her in-depth articles brought significant attention to the issue, showcasing her ability to handle complex investigative stories with precision and clarity.

Xantha Leerssen began her journalism career at De Volkskrant, one of the leading newspapers in the Netherlands. During her tenure, she focused on covering domestic news, honing her skills in investigative journalism and building a reputation for thorough reporting.