- Hearing before the Oversight Committee,”Protecting Those Who Blow the Whistle on Government Wrongdoing,” January 29, 2020: Testimony on behalf of David K. Colapinto (Transcript)
- Hearings before the U.S. House of Reppresentatives Committee on Oversight and Government Reform Subcommittee on Government Operations and the Subcommittee on Health Care, Benefits and Administrative Rules, “Restoring Power of the Purse: Legislative Options,” December 1, 2016: testimony on the the False Claims Act (transcript).
- Hearings before the Senate Democratic Policy Committee, “Abuses in Private Security and Reconstruction Contracting in Iraq: Ensuring Accountability, Protecting Whistleblowers,” September 21, 2007: Testimony on behalf of the National Whistleblower Center and as attorney for a witness.
- Hearings before the House Committee on Government Oversight, “What Price Free Speech? Whistleblowers and the Garcetti v. Ceballos Decision,” June 29, 2006: Testimony on behalf of the National Whistleblower Center.
- Hearings before the Senate Democratic Policy Committee, “An Oversight Hearing on Waste, Fraud and Abuse in U.S. Government Contracting in Iraq,” June 27, 2005: Attorney for a witness.
- Hearings before the Senate Committee on Governmental Affairs, “Hearing on S. 1538, the Federal Employee Protection of Disclosures Act,” November 12, 2003: Testimony on behalf of the National Whistleblower Center.
- Hearings before the House Committee on Science, “EPA’s Sludge Rule: Closed Minds or Open Debate,” March 22, 2000: Testimony on behalf of the National Whistleblower Center.
- Hearings before the Senate Judiciary Committee’s Subcommittee on Administrative Oversight and the Courts, “Administrative Oversight of the Investigation of TWA Flight 800,” May 10, 1999: Attorney for a witness.
- Hearings before the Senate Judiciary Committee’s Subcommittee on Administrative Oversight and the Courts, “Oversight Hearings on the FBI Crime Lab,” September 29, 1997: Testimony as attorney for a witness.
- Hearings before the House Judiciary Committee’s Subcommittee on Crime, “Oversight Hearings on the Activities of the Federal Bureau of Investigation,” May 13, 1997: Attorney for a witness.
- Joint hearings before two subcommittees of the House Committee on Government Operations (Environment, Energy and Natural Resources; Legislation and National Security), “Elevation of the Environmental Protection Agency to a Cabinet-Level Department,” May 6, 1993: Testimony on behalf of the National Whistleblower Center.