Brantner grew up in Neuenburg/Rhein. After graduating from the bilingual "Deutsch-Französisches Gymnasium" in Freiburg im Breisgau and gathering her first international experiences working at the offices of the Heinrich Böll Foundation in Tel Aviv and Washington D.C. she studied political science with focus on International Affairs and European Policy at the Sciences Po in Paris and School of International and Public Affairs, Columbia University in New York City, where she graduated in 2004. In 2010, Brantner defended her PhD thesis "The reformability of the United Nations" at the University of Mannheim where she used to be a research associate at the department for Political Science II of Prof. Dr. Thomas König with a lectureship for International Policy. From 2006 to 2007, she worked as a research associate at the European Studies Centre of St Antony's College, Oxford. During the conference "Peking+5" of the UN Plenum in 2000 and until 2005 Brantner was Vice President of the "Youth Caucus" belonging to the United Nations Commission on the Status of Women. She also worked as a consultant for the United Nations Development Fund for Women, the Women’s Rights Organisation of the UN. In Brussels she coordinated a project in cooperation with the French EU Presidency of 2008, which developed the European master plan for the resolution 1325 of the UN Security Council. In 2010, Branter was co-author of a study concerning the EU Human Rights Policy on behalf of the European Council on Foreign Relations. According to the study, 127 out of the 192 members of the United Nations General Assembly voted against EU stances on human rights, up from 117 last year; only half of democratic countries outside the Union voted with it most of the time. For the Bertelsmann Foundation, she worked in Brussels on the subjects of European Foreign Affairs and European answers to the banking crisis. Brantner speaks fluent French, English and Spanish and is able to communicate in Hebrew.
Political career
In 1996, Brantner became a member of the Green Party Youth at the age of 17. She then was part of the Green Party's local administration in Baden-Württemberg and their Federal Board. During her studies at Sciences Po in Paris she founded a Green university group and was co-organiser of the first "European Students Convent" in 2001/2002. She is a member of the General Assembly of the Heinrich Böll Foundation, was member of the Peace and Security Commission of the Green national party and was one of the authors of the party's manifesto for the European election in 2009.
In 2012, Brantner was elected to the Bundestag for Alliance '90/The Greens, succeeding Fritz Kuhn as representative of the 274th district Heidelberg. Following the 2013 federal election, she became a member of the Bundestag. Between 2014 and 2017, Brantner served as chairwoman of the parliamentary Sub-Committee for Civilian Crisis Prevention and as member of the Committee on Family Affairs, Senior Citizens, Women and Youth. Since 2017, she has been serving as secretary of her parliamentary group, in this position assisting the group's chairs Katrin Göring-Eckardt and Anton Hofreiter. She also serves on the Committee on European Affairs. Since 2019, she has been a member of the German delegation to the Franco-German Parliamentary Assembly. In addition to her committee assignments, Brantner is a Deputy Chairwoman of the German-Egyptian Parliamentary Friendship Group. She is also part of the Elie Wiesel Network of Parliamentarians for the Prevention of Genocide and Mass Atrocities and against Genocide Denial.
Other activities
EastWest Institute, Member of the Parliamentarians Network for Conflict Prevention