Didn't know Mark Weinberger also worked under Clinton at SSA…
https://weatherhead.case.edu/about/notable-alumni/profile?name=mark-weinberger
In addition to his time at EY, Weinberger previously served as the Assistant Secretary of the United States Department of the Treasury (Tax Policy) in the George W. Bush Administration. He was also appointed by President Clinton to serve on the US Social Security Administration Advisory Board, which advises the President and Congress on all aspects of the Social Security system. He has also held other US government and policy positions, including Chief of Staff of President Clinton's 1994 Bipartisan Commission on Entitlement and Tax Reform; Chief Tax and Budget Counsel to US Senator John Danforth (R-Missouri); advisor to the National Commission on Economic Growth and Tax Reform; and Commissioner on the National Commission on Retirement Policy.
Weinberger was co-founder of Washington Counsel, P.C., a Washington D.C.-based law and legislative advisory firm that merged into EY and now operates as Washington Council EY.