As a leader of the biggest humanitarian organisation in the country, Maksym is committed to secure expanding, and efficiency of humanitarian aid and funds flow to reach the most vulnerable populations in Ukraine. He is determined to ensure that the organisation's actions align with humanitarian principles and that it works closely with the Ukrainian government and other humanitarian agencies to coordinate efforts and increase the overall effectiveness of aid in the country.

He is a Polish diplomat with 25 years of professional experience. In 2001-2008 he was Deputy Head of the Permanent Representation of the Republic of Poland to the European Union; and during five years he was also Poland's first permanent representative in the EU's Political and Security Committee. He then joined the European Commission as Director in DG Development focusing on policy coherence, aid effectiveness, financing, relations with other donors and public information. In 2009 he was seconded from the European Commission to become head of cabinet of Jerzy Buzek, President of the European Parliament. From 2011 until 2015 he was Deputy Secretary-General of the European External Action Service. Between 2016 and February 2022 Mr Popowski was Deputy Director-General in the Directorate General for Neighbourhood and Enlargement Negotiations of the European Commission.