Before her appointment as commissioner, she served as staff director and counsel of the United States Senate Committee on Banking, Housing, and Urban Affairs.

[2] Casey was primarily responsible for guiding the chairman's and committee's consideration of, and action on, issues affecting economic and monetary policy, international trade and finance, banking, securities and insurance regulation, transit and housing policy, money laundering and terror finance.

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.