Kaja Kallas is an Estonian politician and diplomat. She was the first female prime minister of Estonia, a role she held from 2021 until 2024, when she resigned in advance of her appointment as High Representative of the European Union for Foreign Affairs and Security Policy. The leader of the Reform Party since 2018, she was a member of parliament (Riigikogu) in 2011–2014, and 2019–2021. Kallas was a member of the European Parliament in 2014–2018, representing the Alliance of Liberals and Democrats for Europe. Before her election to Riigikogu, she was a lawyer specialising in European competition law.