Prof. dr. Stef van Weeghel is a professor of international tax law at the faculty of law at the University of Amsterdam. He is chair of the tax department and director of the Amsterdam Centre for Tax Law.

Prof. Van Weeghel graduated from the University of Leiden (1983 Business Law; 1987 Tax Law) and obtained an LLM in Taxation from New York University (1990). In 1997 he received a doctorate in Law from the University of Amsterdam (dissertation: Improper Use of Tax Treaties).

In 2000 he was appointed professor of international tax law at the University of Amsterdam.

He authored and co-authored several books and numerous articles on international taxation.

Prof. Van Weeghel was also partner and Global Tax Policy leader at PwC until his retirement from that role in July 2023. He was partner at Linklaters from 2007-2009 and partner at Stibbe from 1992-2007, where was admitted to the Bar in 1987. At Stibbe he was member of the Management Board, chair of the tax practice and resident partner in the New York office (where he worked from 1988-1990 and from 1992-1996). He was a member of the board of several academic and professional organizations, including the Dutch Association for Tax Research (Vereniging voor Belastingwetenschap). He acted as secretary and chair of the Dutch branch of the International Fiscal Association (IFA), is immediate past chair of IFA’s Permanent Scientific Committee and is an honorary member of IFA. He is chairman of the Board of Trustees of the International Bureau of Fiscal Documentation (IBFD). He is also member of the Advisory Board of the Belt and Road Initiative Tax Administration Cooperation Mechanism (BRITACOM) and member of New York University School of Law's Practice Council of the International Tax Program.

In his academic research Prof. Van Weeghel focuses on interpretation of tax treaties, abuse of tax treaties, and the interaction between tax treaties and bilateral investment treaties.

In his practice Prof. Van Weeghel's focus was on tax policy, strategic tax advice and tax controversy. He has extensive experience in cross-border transactions, structuring and dispute resolution. He regularly rendered advice and second opinions to clients and to other advisers, on corporate income tax and tax treaty matters and is consulted by the Dutch government and political parties on a regular basis.

He continues to act as counsel and as expert witness in tax matters (for taxpayers and for governments) before Dutch and foreign courts and in arbitration pursuant to bilateral investment treaties and in commercial arbitration.

In 2009/2010 he chaired the Study Group Tax System, a committee that advised the Dutch government on comprehensive tax reform. In 2000 he was a member of the Van Rooy-Committee that advised the Dutch government on corporate income tax reform. Prior thereto he was member of a working group at the Dutch Ministry of Finance that worked on revision of the Dutch ruling practice. He also worked on the review of administrative practices in taxation for the European Commission. He participated in the work of the OECD on tax certainty and has presented his work on tax treaty abuse to the OECD Global Forum. On various occasions he appeared as expert before the Finance Committees of the Second and First Chamber of the Dutch Parliament and he also appeared before the TAXE-Committee and the PANA-Committee of the European Parliament.