ADIT International Tax Webinar Series

Wednesday, September 30, 2020 -
2:00pm to 3:30pm
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Digital taxation: Panel session

with Colm Mooney, Sam Sim and Jefferson VanderWolk

Bringing together leading experts from intergovernmental institutions and industry, this webinar will explore recent trends and developments in the international taxation of digital and online activities, including the following:

  • Recent OECD developments and trends among national governments
  • The challenge of achieving a unified approach to digital taxation
  • Perspectives from technology and multinational firms

The fee for this event is £20 (free for International Tax Affiliates).

Entry is open to ADIT students and holders, and anyone else who is interested in international tax.


About the speakers






Colm Mooney is the Operational Transfer Pricing Policy and Process Senior Manager for Pfizer Pharmaceuticals, working in Pfizer’s Transfer Pricing Centre of Excellence (COE) located in Dublin, Ireland.

Previously working as a practice accountant, Colm moved in to the telecommunications industry in 2002 before joining Pfizer in 2006. Having managed various financial functions within Pfizer, Colm transitioned to Pfizer’s Operational Transfer Pricing COE in 2016.

Colm holds a primary degree in Accounting and Human Resource Management, and is a Fellow of the Association of Certified Chartered Accountants (ACCA). He is an International Tax Affiliate of the CIOT and an ADIT holder.

As an ADIT Champion, Colm currently leads our ADIT network in Ireland and is engaging with tax professionals across the country in strong collaboration with the Irish Tax Institute.









Sam Sim is a board member of Tax Analyst, USA, former New York tax attorney and qualified Chartered Accountant. Passionate in digital taxation, he holds an appointment as research fellow at the Center for Artificial Intelligence at SMU, has co-authored IEEE and IBM Research papers on Blockchain and teaching digital tax at the Singapore Management University and SUSS Master in Tax programme.

Sam brings deep industry expertise having served as Regional Vice-President (Europe, Middle-East, Africa, Asia and Latin America) of the Tax Executives Institute, having led global teams and regional teams as a tax leader in a large European FTSE 100 and US Fortune 100 multinational enterprise.

Sam has a broad repertoire of international tax expertise having practiced as a New York tax attorney, a consultant to the United Nations and the Asia Development Bank and edited the foremost book in Asia on BEPS, Asia Voices: BEPS and Beyond, published by the IBFD.

Sam has taught at the Leiden International Tax Centre, Shanghai FuDan University, SAT Yangzhou centre, Universitas Indonesia, BIR Philippines National Training Center, Singapore and Malaysia Tax Academies, Vienna University’s courses and IBFD programmes, with particular depth in transfer pricing, intellectual property, financial services and technology.








Jefferson VanderWolk is a partner at Squire Patton Boggs, and helps organisations, businesses and individuals understand and respond to global developments in cross-border taxation. Drawing on both technical expertise and policy-making experience, he helps clients navigate complex, emerging areas of tax law such as the taxation of the digital economy, transfer pricing, and treaty-based structuring.

Jefferson has extensive experience in private practice and government and agency work, most recently as Head of the Tax Treaty, Transfer Pricing and Financial Transactions Division at the OECD's Centre for Tax Policy and Administration in Paris. There, he was at the forefront of shaping international tax policies, and responsible for the rollout of transfer pricing guidance as well as the multilateral treaty instrument currently being implemented in many countries around the world.

Jefferson has also worked at the heart of US tax policymaking, gaining deep knowledge of tax reform and its practical applications. He has advised clients in the US, Asia Pacific, and Europe on tax planning, structuring, and compliance across numerous industry sectors.

Jefferson is a Fellow of the CIOT, and a member of the ADIT Academic Board.

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