In 2010, Financial News determined that Wellink as the one man who is believed to have wielded the greatest influence on worldwide financial oversight including "game-changing proposals on capital requirements and liquidity" for the world’s banks. He was President of De Nederlandsche Bank (DNB), a Director of the Bank for International Settlements (BIS) from 1997 to 2012 and Chairman of the Board from 2002 through 2006. Also, Wellink was a member of the Governing Council of the European Central Bank from 1999 to 2012, a Governor of the International Monetary Fund (IMF) and a member of the Financial Stability Board (FSB). Since October 2012 he has been a member of the board of the Bank of China.
From 1970 to 1982, Wellink worked at the Dutch Ministry of Finance. He rose through the bureaucracy to become Director General of Financial and Economic Policy. He also held the post of Treasurer General.
In 1982, he became Executive Director of De Nederlandsche Bank (DNB), the central bank of The Netherlands. In 1997, he was named president of the bank. On 1 July 2011 his second term as president of DNB ended.
Nout Wellink's career has also been criticised. Under his supervision some serious problems arose in the Dutch banking sector where DNB's actions have become under scrutiny by Dutch parliament:
- The bankruptcy of Landsbanki (Iceland) which bank was awarded a banking permit in 2008 (trading under the name Icesave) whilst the Banque de France had supposedly rejected a French banking permit. Formally Banque de France later on stated that they never received request from Icesave for permit as a "credit institution" but it was allowed to progress with its pending business in France. Later that same year Landsbanki went bankrupt and was nationalized by the Icelandic government.
- The bankruptcy of DSB in 2009 which bank was awarded a banking permit by DNB in 2005. Subsequent analysis showed that at the time the banking permit was awarded DSB's risk management still had serious flaws and also the continuity of its business model was deemed risky. Based on a plan of improvement and appointment of a supervisory board DNB issued the permit. After the demise of DSB it turned out that the supervisory board had little influence on the behaviour of its CEO Mr. Dirk Scheringa, the planned improvement of its risk management was far behind schedule and the change of its businessmodel also wasn't implemented.
- In 2007 Fortis, Banco Santander and RBS successfully purchased ABN Amro with the plan to split the bank into different pieces. Though a major system bank and pivotal for the Dutch economy DNB approved the takeover. In 2008 it turned out that Fortis was hurt badly by the credit crisis which ultimately led to nationalization of both Fortis and ABN Amro by the Dutch and Belgian government. the Dutch parliament researched this action and DNB's actions were highly criticized.
From 2006 through 2011, Wellink was chairman of the Basel Committee on Banking Supervision (BCBS). BCBS examines and proposes ways to reconfigure global banking regulations. Wellink's point of view is not fixed, encompassing the premise that "a resilient banking system is central to sound financial markets and growth. Supervisors cannot predict the next crisis but they can carry forward lessons from recent events to promote a more resilient system which can weather shocks, whatever the source."
- Beyond the crisis: the Basel Committee’s strategic response (2009)
- President's speech (2005)
- The role of national central banks within the European System of Central Banks: The example of De Nederlandsche Bank (2002), with Bryan Chapple and Philipp Maier
- Jonge wijn in oude zakken : op weg naar een nieuwe Nieuwe economie (2001)
- Overheidsfinanciën (1978), with Lenze Koopmans, 201 pages
- Commander of the Order of Orange-Nassau
- Knight of the Order of the Netherlands Lion
- Honorary doctorate from the University of Tilburg
- Ahuja, Vivek. "And the most important financial regulator of 2010 was...," Wall Street Journal (US). January 19, 2011; citing and FN100 which annually ranks the most influential people in the European capital markets
- Nout Wellink bio notes, Wall Street Journal (US).
- De Nederlandsche Bank (DNB), Governing Board
- 'Wellink in bestuur van Bank of China', NRC Handelsblad, 19 November 2012
- Curriculum vitae A.H.E.M. Wellink
- "Mededeling Franse centrale bank over Landsbanki / Icesave - De Nederlandsche Bank".
- "Reconstructie: hoe Dirk Scheringa door het ijs zakte".
- "Parlementaire Enquêtecommissie Financieel Stelsel", www.tweedekamer.nl/kamerleden/commissies/pefs/rapport.jsp
- Ewing, Jack. "Central Banker Takes a Chance by Speaking Out," New York Times (US). November 1, 2010.
- Choudry, Moorad. (2010). Structured Credit Products: Credit Derivatives and Synthetic Securitisation, p. 12, p. 12, at Google Books; compare "The Group of Governors and Heads of Supervision reach broad agreement on Basel Committee capital and liquidity reform package," Bank for International Settlements Press Release, 26 July 2010
- "WorldCat Identities". oclc.org.
- Hoge onderscheiding voor Nout Wellink - website nu.nl (Dutch)
- Choudry, Moorad (2010). Structured Credit Products: Credit Derivatives and Synthetic Securitisation. Hoboken, New Jersey: Wiley. ISBN 9780470824139. OCLC 437082963.
- This article incorporates information from the article Nout Wellink on the Netherlands Wikipedia.