Roger J. M. Dassen (1965) is Global Managing Director, Clients, Services, and Talent, of Deloitte Touche Tohmatsu Limited (DTTL) as of 1 June 2011. He is a member of the DTTL Executive. Dassen has also served as CEO of Deloitte Netherlands.

His previous leadership roles included serving as National Managing Director Accounting & Auditing of Deloitte Netherlands and as a member of Deloitte Touche Tohmatsu Global Assurance Leadership Team. He has been a Deloitte Netherlands audit partner since 1996 and has served as advisory partner and/or global Lead Client Service Partner (LCSP) for a number of the firm’s largest clients.
Dassen’s professional activities include serving as Chairman of the International Federation of Accountants (IFAC) Transnational Auditor’s Committee, a member of IFAC’s International Auditing and Assurance Standards Board, and Chairman of the Auditing Standards Board of Royal NIVRA, the Dutch Institute of Chartered Accountants.
He is author of several textbooks on auditing in English, Mandarin and Dutch, and has published a significant number of academic and professional articles. Roger Dassen is an honorary professor of auditing at the University of Maastricht and a full professor of auditing at the Free University of Amsterdam. He is a Dutch CPA, has a master’s degree in economics and business administration, and a PhD in business and economics from the University of Maastricht.