Nominations Committee

Natalia Quiñones is the current President of the International Fiscal Association (IFA) and an international tax partner at Quiñones Cruz in Bogotá, Colombia. She was an advisor to the Colombian Minister of Finance on international taxation until August 2024. Until January 2020, she was director of the Office of International Affairs at the National Tax and Customs Directorate (DIAN).

She is a PhD candidate in Tax Law at the University of Amsterdam (UvA). She holds a law degree from the Universidad del Rosario, a philosophy degree (summa cum laude) from the Universidad de los Andes, and a Master of Laws (Gerard Wallace Scholar) from New York University (NYU).

She is a member of the IFA's Permanent Scientific Committee and the board of directors of the Colombian branch of the IFA, which she chaired until July 1, 2020. She currently teaches international taxation at the University of Los Andes and is a guest lecturer at various venues worldwide.

Dr. Adolfo Martín Jiménez is a Professor of Tax Law at the University of Cádiz (Spain) and the author of several books and over one hundred articles on international and EU tax law.

He has extensive practical experience—including involvement in disputes and arbitrations—in international taxation, EU tax law, and transfer pricing.

Dr. Martín Jiménez frequently serves as a consultant for multinational groups, law firms, governments, and major international organizations in the field of international taxation. 

He currently serves as Chairman of the Permanent Scientific Committee of the International Fiscal Association and was a former Chairman of the European Association of Tax Law Professors.

Global Head of Tax, Siemens AG
Global Head of Tax and Corporate Vice President at Siemens since 2009, based in Munich, 
responsible for the global Siemens team of 690 tax and customs experts. Christian is the Vice 
President and member of the executive board of Global IFA (since 2025). He is the co-chairman of the BIAC Tax Committee (since 2025), chairman of the tax commission of the German Federation of Industries (BDI) (since 2021), chairman of the supervisory board of WTS AG (since 2009) and member of the advisory council of the Belt and Road Administration Cooperation Mechanism (BRITACOM – since 2020). 

Alexia Kardachaki is the Secretary-General and Head of Secretariat of Global IFA. She is an international and EU tax lawyer and, prior to joining Global IFA, held senior positions in international tax advisory and law firms (Lubbers, Boer & Douma, PwC, KPMG Meijburg & Co), industry (LyondellBasell), and business groups (European Business Tax Forum). 

She holds (tax) law degrees/diplomas from the National and Kapodestrian University of Athens (LL.B.), Athens University of Economics and Business (postgraduate diploma), Vienna University of Economics and Business (LL.M.), Vrije Universiteit Amsterdam (LL.M.), and the University of Lausanne (executive diploma).

She was the IFA research associate in 2012-2013 and national reporter for the IFA Cahiers in 2014 (for Greece) and in 2022 (for the Netherlands). She is one of the founding members of the Women of IFA Network in the Netherlands and served as a board member of the IFA Netherlands (2021-2024). She was a member of the Organising Committee of the 3rd IFA European Region Conference, which took place in Amsterdam in 2023. 

Valentin Savov is the founder and managing partner of Savov & Partners Law Firm. With 20 years of international and domestic legal experience, Valentin has built a distinguished career across leading law firms in Amsterdam, Tokyo, and Sofia, Bulgaria.

Valentin is currently vice-chair of the Supervisory Board of IFA and since 2014 chair of the Bulgarian branch of IFA.

Valentin is a frequent speaker and lecturer at post-graduate programs, seminars and conferences and regularly contributes to different domestic and international publications.

Valentin is an arbitration judge at the Arbitration Courts of the Bulgarian Chamber of Commerce and the German-Bulgarian Chamber of Industry and Commerce.

Valentin holds an LL.M. in Law from Sofia University and a postgraduate LL.M. in International Tax Law from the International Tax Center at Leiden University, the Netherlands.

Peetinuch "Tong" Utaiwan is Senior Director, Asia-Pacific Tax at Netflix, Singapore. With over two decades of experience across Big Four advisory, global law firms, and in-house roles at Amazon, Uber, and GE, she brings deep expertise in international tax, tax controversy, and cross-border structuring.

Tong serves on the Supervisory Board of the International Fiscal Association (IFA) globally and IFA Singapore's Executive Committee. She holds an Executive MBA from INSEAD, an Executive LL.M. in Taxation from NYU, and degrees from Northwestern/Kellogg and Columbia Law School. Admitted to the New York State Bar.

Tom Roesser is Tax Policy Counsel for Microsoft Corporation and is a member of Microsoft’s Tax & Customs Leadership Team. Tom’s team is responsible for Customs, Tax & Customs Controllership, Policy, and Benefits Taxation.Before joining Microsoft, Tom served as Tax Counsel to the U.S. Senate Committee on Finance and practiced law and accounting.

Tom started his career as a certified public accountant in California and is an attorney licensed to practice in California and the District of Columbia. He holds a Dual LL.M. (with distinction) in Taxation and International and Comparative Law from Georgetown University Law Center, a J.D. from Loyola Law School in Los Angeles, and a BS in Business Administration (emphasis in accounting) from the University of Southern California.

Tom is a Board Member of the International Tax and Investment Center, National Foreign Trade Council (and former Chair of the Tax Committee), the Tax Council, and the Tax Foundation. He is a Vice-Chair of the International Chamber of Commerce’s Taxation Commission and the U.S. Council for International Business Tax Committee. Tom is a Vice President of IFA USA, a member of the Central IFA Supervisory Board, and involved in various U.S. and international organizations.

Patrick is widely recognized as a leading international tax lawyer, having specialized in cross-border tax planning and M&A for more than 25 years.

Patrick is the former Co-Chair of Osler’s National Tax Group, the former President of the Canadian branch (and former chair of the North American region) of the International Fiscal Association (IFA), a member of the Supervisory Board of Global IFA and a member of the Board of Governors of the Canadian Tax Foundation.

He provides clarity and creativity as a trusted adviser to many of Canada’s largest companies with a practice that includes all aspects of corporate income tax including advisory, transactional and disputes work.

Patrick represents clients in various industries including financial services, technology, mining, telecom, manufacturing and private equity. Patrick has appeared before the Canadian House of Commons Standing Committee on Finance and the Canadian Senate Banking Committee as an expert on international tax matters.

Prior to joining Osler, Patrick drafted tax laws and formulated tax policy related to foreign affiliates and foreign investments with the Canadian Department of Finance. 

Patrick also has a Masters in U.S. tax from NYU.

Patrick is a frequent author and speaker at conferences on various Canadian tax matters and is regularly highly ranked for his expertise in tax law by Chambers Global, Lexpert Guide to Leading 500 Lawyers in Canada, Best Lawyers in Canada, Legal 500, Who’s Who Legal, and Thomson Reuters.

Patrick received the Bloomberg BNA: Leonard L. Silverstein Award for Distinguished Service in International Tax.