Leon is senior IT-auditor in the Oversight Department of De Nederlandsche Bank, the central bank of the Netherlands, and he is currently focusing on the resilience and continuity of the financial sector. He is vice-president of IFIP, the IFIP General Assembly member for the Dutch Computer Society (NGI) and the past chair of IFIP Technical Committee 11 on the Security and Protection of Information Processing Systems. He was an ISC member for WITFOR 2003 and program chair for WITFOR 2007.