From 1994 to 1996, Casey served as staff director of the Subcommittee on Financial Institutions and Regulatory Relief of the Senate Banking Committee. She was responsible for advising and staffing the Senator on all committee issues, including the Private Securities Litigation Reform Act, Whitewater special investigation, and financial services regulatory relief legislation. Casey also served Senator Shelby as legislative assistant from 1993 to 1994, during which she was responsible for handling all tax, budget, and finance policy matters.