William Heidepriem-Baird represents technology companies and financial institutions in government investigations and regulatory enforcement matters. In addition to conducting internal investigations, he has represented clients in investigations conducted by Congress and diverse state and federal agencies, including the Federal Reserve, the US Securities and Exchange Commission (SEC), the US Department of Justice (DOJ), the Commodity Futures Trading Commission (CFTC), the Office of the Comptroller of the Currency (OCC), state attorneys general and state securities regulators.

His investigations experience includes retail trading surveillance and market manipulation, artificial intelligence safety, alleged misleading and inadequate disclosures, alleged accounting irregularities, internal audit and corporate governance, anti-money laundering (AML) policies and sanctions screening, and the offering of derivatives products. His practice focuses on alleged fraud and compliance failures under the federal and state securities, commodities and banking laws, including Regulation Best Interest, broker-dealer supervisory obligations, the Bank Secrecy Act and AML rules, and New York's Martin Act, as well as the Foreign Corrupt Practices Act (FCPA). He has also represented clients in white collar defense and complex commercial litigation and has advised clients on the securities status of digital assets.

Prior to joining the firm, Mr. Heidepriem-Baird worked as a managing associate at a global law firm in Washington DC. After law school, he served as a law clerk to Judge Andrew L. Brasher on the US Court of Appeals for the Eleventh Circuit and the US District Court for the Middle District of Alabama.

Mr. Heidepriem-Baird maintains an active pro bono practice focused on foster care, human trafficking and tenants' rights. He has represented tenants through the DC Landlord Tenant Resource Center. He has been named to the Capital Pro Bono Honor Roll, which recognizes attorneys who dedicate significant pro bono service to expanding access to justice in the District of Columbia.