Koopman joined the
European Commission in 1991, as official at the
Directorate-General for Economic and Financial Affairs. In 2023, Koopman took the position of Director General
for Neighbourhood and Enlargement Negotiations . Koopman toured the region to discuss the growth plan with the region’s state representatives. In his role, Koopman is responsible for negotiations with Ukraine on the accession of the war-torn country to the
European Union following the
Russian invasion of Ukraine. Koopman has insisted in his discussion with the Ukrainian government on anti-corruption reforms in the country. ==Personal life==