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 2017, 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.

In addition, Bob 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.

Bob is a graduate of the State University of New York at Albany (B.A. 1976) and has an M.A. in French Language and Civilization from New York University. Bob received his J.D./M.S.F.S. from Georgetown University in 1984, where he served as Editor-in Chief of the Georgetown Law Journal. After law school Bob clerked for the Hon. Thomas A. Flannery of the U.S. District Court for the District of Colombia (1984-85), as well as Justice Potter Stewart (Ret.) of the United States Supreme Court (1985-6).