Gretchen Sierra is a principal in Deloitte Tax LLP's Washington National Tax-International Tax Services group. She leads this group and aids US and foreign-based multinationals with a broad range of international tax matters, including supply chain structuring, IP migrations, US income tax treaties, inbound planning, financing transactions and cross-border mergers and acquisitions.
Prior to joining Deloitte in January 2009, Gretchen was the Deputy International Tax Counsel in the Office of Tax Policy of the US Treasury Department. As Deputy International Tax Counsel she had responsibility for a broad spectrum of US tax treaty and international tax regulatory and legislative matters, including the contract manufacturing regulations. Prior to joining the Treasury Department in 2005, she was a Legislation Counsel for the Joint Committee on Taxation, US Congress where she advised the House Ways & Means Committee, the Senate Finance Committee, and other members of Congress on proposed international tax legislation including the American Jobs Creation Act of 2004.
She is an adjunct professor at the Georgetown University Law Center. She is also a co-author of the Tax Management Portfolio entitled, Planning Matrix for US Based Multinational Corporations.