Mark Prater serves as a Managing Director in PwC’s Tax Policy Services practice in Washington, DC. In his role, Mark advises clients with respect to tax policy issues and tax legislation with a concentration on the Tax Cuts and Jobs Act of 2017.

Before joining PwC, Mark spent 28 years in the Senate, most recently as Chief Tax Counsel and Deputy Staff Director for the Senate Finance Committee. He was instrumental in the passage of the Tax Cuts and Jobs Act of 2017.​
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From 1990 through 1993, Mark served as a tax counsel on the Republican staff of the U.S. Senate Finance Committee. In 1993, he was promoted to Chief Tax Counsel on the Republican staff of the Senate Finance Committee and added the role of Deputy Staff Director of the Republican staff in 2007. In 2011, Mark was selected as Staff Director for the Joint Select Committee on Deficit Reduction (“JSCDR”), known as the "Super Committee." Mark retired from Federal service in May 2018.
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Mark graduated from Portland State University in 1981 with a B.S. in accounting ​and worked on a governmental audit under the direction of a team from Coopers and Lybrand. He obtained a J.D. from Willamette University in 1984 and an LL.M. in Taxation from the University of Florida in 1987. ​He became a member of the Oregon and Washington State bars in 1984 and a certified public accountant in Washington in 1986. He practiced with Touche Ross from 1984 to 1986 and a Portland law firm, Dunn, Carney et al. from 1987 to 1990.
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Mark frequently speaks to national professional tax organizations such as the American Bar Association, American Institute of Certified Public Accountants, Federal Bar Association, the Tax Executives Institute, and the Tax Council. Mark also speaks to state professional tax groups such as the Oregon State Bar, Oregon Society of Certified Public Accountants, Iowa State Bar, Florida Bar, and the New York State Bar Association. In addition, Mark has guest lectured at colleges, universities, and professional schools.