too crowded and further protests where cancelled and stopped. On 1 July 2021, Halsema apologised for the city's involvement in the Atlantic slave trade. Work outside of politics After she left politics in January 2011, Halsema worked as freelancer: she has been active as an administrator, member of advisory committees, in science, as an author and television creator. Immediately after her political career, Halsema joined De Volkskrant, for which she wrote number of articles and columns in 2011 and 2012. In 2013, she was involved in De Correspondent, for which she also wrote articles for two years. In 2016 she wrote her political memoir Pluche. In 2017 she wrote the Essay Nergensland. Nieuw Licht op migratie ("Nowhereland. A new light on migration"), where she proposed a utopian alternative to the international refugee question. In 2018 she wrote the essay Macht en Verbeelding ("Power and Imagination"). In 2011, she became professor by special appointment at Tilburg University occupying the Leonardo Chair for half a year. She taught at the Tilburg School of Humanities. In 2012 she became a temporary professor at University of Utrecht, occupying the Peace of Utrecht Chair. She researched the meaning of social media for human rights and democracy. In December 2012, she led an inquiry into the behaviour of administrators at the school board of Amarantis. She succeeded Martin van Rijn, who had become junior minister of Health. The committee Halsema found that the board had acted within the law but that their behaviour was not desirable. After that she led a committee on the governance code for the semi-public sector at the request of the Minister of Economic Affairs Henk Kamp The final report of the committee concluded that a governance code would not lead to the desired culture change in the semi-public sector. The committee focused its attention on the old boys network and political cooperation. In 2015 she was asked by employees and students at the University of Amsterdam to lead the committee concerning the financial policy of the University. After a month she returned the assignment. The committee felt that elementary conditions were not met for independent, careful research. Since January 2018, Halsema at the request of the Council of the Judiciary chair of the quadrennial review committee. Since 2011, Halsema has been President-Commissioner at WPG Uitgevers, which is among other responsible for the publisher De Bezige Bij, Vrij Nederland and Voetbal International.