Brownstein Adds Former Senate Finance Committee Chief Tax Counsel Mark Warren to D.C. Office

Brownstein Hyatt Farber Schreck is pleased to announce that veteran congressional tax counsel Mark Warren will join the firm as a shareholder in the firm’s Washington, D.C., office. Warren adds senior-level experience to Brownstein’s Tax and Financial Services team in Washington having served as chief tax counsel to the Senate Finance Committee, tax counsel to the House Ways and Means Committee and deputy assistant secretary for legislative affairs at the Department of the Treasury. 

“Mark is one of the most well-respected tax attorneys on the Hill. He has worked on every major tax policy debate since the Clinton administration, and I’m proud to have worked with him during my time with the Senate Finance Committee,” said Russ Sullivan, who heads Brownstein’s National Tax Practice.

“Mark is an excellent addition to our Tax and Financial Services team. His senior leadership experience in both houses of Congress and at Treasury are especially valuable to our clients as we continue to navigate the effects of FFCRA, the CARES Act and COVID-19 relief in the year-end Consolidated Appropriations Act, which Mark managed during his time with the Senate Finance Committee,” said Marc Lampkin, Brownstein’s Government Relations Department chair. 

Warren most recently served as chief tax counsel to the Senate Finance Committee where he was responsible for the development and implementation of Chairman Chuck Grassley’s (R-IA) tax agenda, including advising on all aspects of federal tax, retirement, pension and tax-administration policy. He also managed the committee’s COVID-19 tax and pension relief legislation. As senior tax counsel in the office of Sen. John Thune (R-SD), Warren contributed to the development and drafting of key parts of the Tax Cuts and Jobs Act (TCJA), drawing on his tax-reform experience from the House Ways and Means Committee under then-Chairmen Dave Camp (R-MI), Paul Ryan (R-WI) and Kevin Brady (R-TX). Following his time as deputy assistant secretary for the Bush Treasury Department, Office of Legislative Affairs, Warren spent two years as vice president for tax and finance at the Retail Industry Leaders Association. 

Warren started his career on Capitol Hill in 1995 as tax counsel to the House Committee on Small Business and later to the Senate Committee on Small Business and Entrepreneurship, and he has served as an adjunct professor at Georgetown University’s McDonough School of Business. 

“I’ve known Russ and the Brownstein tax team for much of my career, and following more than 20 years serving in the Senate, House and administration, I’m excited to join Brownstein’s respected team as I continue my career of working on tax policy,” said Warren.

Warren received his B.S. and J.D. from Georgetown University and his LL.M. from New York University School of Law.