Leszek is the founder and editor-in-chief of Liberté!, a liberal journal and foundation based in Poland.

Liberté! organises the annual Freedom Games, one of the biggest intellectual forums in Central Europe.

Leszek was a Policy Fellow at the School of Transnational Government at the EUI and a non-resident fellow at the Institute of Human Sciences in Vienna where his work focused on the ways of countering the rise of national populism in Europe.

He was selected as a European Young Leader by the Friends of Europe (class 2022). He is a co-host of the Liberal Europe podcast.