Tonko Obuljen has served as Chair of the HAKOM Council since 2018. He was a member of the Information Society Working Group during the negotiations on the accession of the Republic of Croatia to the European Union (2005-2013). In 2002 and 2008, he was also a member of the drafting team for the Electronic Communications Acts and associated bylaws. Previously, he participated in developing the Croatian state aid programmes for backhaul and access networks. In 2020, Tonko Obuljen also served as a BEREC Vice-Chair.