Saar van Bueren is the Deputy Secretary General of the PES (Party of European Socialists & Democrats).
At the European elections in 2024 and 2019, she ran the PES European (spitzenkandidat) campaign as Campaign Manager.
In 2023, as Campaign Director, she also oversaw the joint Green and Labour Party (GroenLinks-PvdA) campaign – led by Frans Timmermans – for the Dutch national elections.
Between 2014 and 2019, Van Bueren was Member of Cabinet to First Vice President Frans Timmermans in the European Commission, where she served as his political and communication adviser.
Before moving to Brussels, she worked as the spokesperson and political strategist for the leadership of the Dutch PvdA (2007-2014), both in government and in opposition.
After studying media and information law at the University of Amsterdam, she started her career in 1999 as a journalist at a local TV station before becoming Press Secretary of AFC Ajax football club.