Bob Stack

Bob advises the US 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 Organization for Economic Co-Operation and Development (OECD).

Bob joined Deloitte Tax from the US Department of the Treasury (Treasury), where he was the deputy assistant secretary for international tax affairs in the Office of Tax Policy. While there, he worked directly with the assistant secretary of tax policy and the international tax counsel in developing and implementing all aspects of US 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 US government at the OECD where he was involved in all aspects of the Base Erosion and Profit Shifting initiative. Prior to joining Treasury, Bob had more than 25 years of experience in international tax matters, representing both corporations and individuals.

Bob is a member of the executive committee of the US Branch of the International Fiscal Association (IFA) and a frequent speaker at IFA events worldwide. He a member of the advisory committee for the Annual Institute on Current Issues in International Tax at The George Washington University School of Law. He is a frequent speaker at events sponsored by such organizations as the Tax Executives Institute, the International Bar Association, American Bar Association Tax Section, and Irish Tax Institute. He presented the Twenty-Second Tillinghast Lecture on International Taxation at the New York University School of Law.

Bob earned his Bachelor of Arts in English education from State University of New York at Albany and his Master of Arts in French language and literature from New York University. He went on to obtain his Master of Science in foreign service from Georgetown University and a Juris Doctor from Georgetown University Law Center, where he was editor-in-chief of the Georgetown Law Journal. After graduating, he clerked for Judge Thomas A. Flannery of the United States District Court for the District of Columbia and Justice Potter Stewart (Ret.) of the United States Supreme Court.