Tom has held senior positions with a range of financial institutions, including supervisory authorities. He was a member of the Governing Board of De Nederlandsche Bank, a member of the Executive Board and CFO of ABN AMRO, and Chairman of the Board of the Zurich Insurance Group. In addition, Tom has developed a broad portfolio of corporate and not-for-profit activities, and has served on several Boards, including as a member of the Supervisory Board of Van Lanschot Kempen NV, the holding company of an independent Dutch bank, where he served as Chairman until the end of 2015. He was also a member of the Advisory Board of the China Banking Regulatory Commission in Beijing from 2009 to 2017.
Tom was Vice Chairman of the Supervisory Board of Royal DSM NV, a Netherlands-based global life-sciences and material-sciences group, until April 2018. He was the Vice Chairman of the Supervisory Board of Royal Ahold NV, a multi-country supermarket chain, and also Chairman of the Amsterdam Financial Centre and Chairman of the Banking Supervisory Sub-Committee of the European Monetary Institute. He became a member of the Basel Committee on Banking Supervision in 1991 and was its Chairman from 1997 to 1998. He was a Non-Executive Director of the UK Financial Services Authority and of GlaxoSmithKline plc.