Thomas Wieser presided over two key advisory bodies of the Eurogroup. He was the president of the Economic and Financial Committee (EFC) of the EU, as well as the president of the Eurogroup Working Group (EWG) from October 2011 to February 2018. The EFC is responsible for preparing the work of the Eurogroup and providing economic policy advice, while the EWG is an advisory body composed of representatives from the euro area member states. Information about his roles can be found on Wikipedia and the official website of the Council of the European Union. Wikipedia and Consilium.europa.eu.