Bob Stack is a Managing Director in Deloitte’s Washington National Tax international tax practice where he advises U.S. companies on a full range of international tax issues and collaborates with Deloitte’s global member firms on international tax developments and initiatives, including those from the Organisation for Economic Co-Operation and Development (OECD). Until January of this year, he was the Deputy Assistant Secretary for International Tax Affairs in the Office of Tax Policy at the US Department of the Treasury where he worked directly with the assistant secretary of tax policy and the international tax counsel in developing and implementing all aspects of U.S international tax policy, including treaties, regulations and legislative proposals.
He also was the official representative of the Obama administration for international tax policy and represented the U.S. government at the OECD where he was involved in all aspects of the Base Erosion and Profit Shifting (BEPS) initiative. Prior to joining Treasury, Mr. Stack had over 26 years of experience in international tax matters, representing both corporations and individuals.
Calum Dewar M.A., A.C.A. is an International Tax Partner in the New York office of PwC. Calum formerly led and is an ongoing member of PwC’s International Tax Structuring Planning Group. This is a core team of 7 Partners drawn from the global network with responsibility for assisting jurisdictions develop best in class inbound and outbound investment structures. As a result of this role Calum has a knowledge of the key aspects of many of the tax systems around the world and an outstanding personal network of the leading International Structuring partners in the PwC Global organization.
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