In addition to his work as a lawyer in Paris, for twelve years Dariusz Szleper was a member of the AIPPI International Bureau, first as Assistant Reporter General, and then as Deputy Reporter General. He directed the work of numerous committees, leading to the adoption of various AIPPI resolutions. He is a Member of Honour of the AIPPI.
From 2000 to 2006, he was the Secretary of the Association of Industrial Property Lawyers (AAPI), which he has been chairing since April 26, 2019, after having been Vice-President between 2016 and 2019.
Between 1998 and 2013, he taught a patent law course at the CEIPI (International Centre for Intellectual Property Studies) in Strasbourg.
He is an editor of the Industrial Property Annals, which have published several of his commentaries.