Mark Hazekamp is professor of pediatric cardiac surgery and working as a cardiothoracic surgeon/ pediatric cardiac surgeon in LUMC, Leiden and AMC, Amsterdam. He is chair of the committee for congenital cardiothoracic surgery and member of the committee for professionality of the Dutch Association for Thoracic Surgery, board member of the European Congenital Heart Surgeons Association (ECHSA), council member of the European Association of CardioThoracic Surgery (EACTS), member of the EACTS Congenital Domain and member of the Guidelines Committee of the same Association.