Marta Kos is a Slovenian diplomat and politician. She served as ambassador to Germany from 2013 to 2017, and as ambassador to Switzerland from 2017 to 2020. Since December 2024, she is the European Commissioner for Enlargement in the second von der Leyen Commission.
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Marta Kos is a Slovenian diplomat serving as European Commissioner for Enlargement in the 2024–2029 European Commission. Kos’s portfolio places her at the institutional center of accession policy for the Western Balkans, Ukraine and Moldova. The European Commission describes her mandate as advancing enlargement while applying the Union’s requirements on democratic institutions, the rule of law and economic preparation. The documented institutional setting matters because formal position determines which outcomes can reasonably be connected to an individual and which belong to a larger government, party, organization or social movement. European Commission (opens in a new tab) provides the primary anchor for that role and period. Read in that context, the useful question is not whether Marta Kos was simply prominent, but what authority, leverage or responsibility the record actually placed in their hands. That distinction is necessary before assessing outcomes, because visibility can be much broader than decision-making power and because many public events involve several institutions acting at the same time.