McNair regularly serves as counsel in government investigations and enforcement matters brought by the Securities and Exchange Commission (SEC), the Financial Industry Regulatory Authority (FINRA), the Department of Justice (DOJ), and U.S. Attorneys' Offices. He also regularly represents clients facing scrutiny from state securities divisions, state attorneys general, and state departments of financial institutions, including multistate investigations across a wide range of jurisdictions.

His representations have involved defense of clients in connection with alleged violations of federal and state securities laws, including disclosure, insider trading, accounting, financial reporting, registration, and supervisory issues; broker-dealer and investment adviser regulation, including fiduciary duty and sales practice matters; and regulatory scrutiny involving cryptocurrencies, digital assets, tokenization, and blockchain-based platforms. He also represents clients in healthcare, defense, and other industries in civil and criminal enforcement matters and False Claims Act investigations.

McNair leads sensitive internal investigations for clients, drawing on experience conducting witness interviews, mining the factual record, and managing the investigation process from start to finish. He regularly advises in-house counsel, boards, audit committees, special investigative committees, and senior management on regarding the client’s most sensitive concerns, including potential misconduct, disclosure obligations, and remediation strategies. His experience quarterbacking internal investigations spans public companies, universities and colleges, government contractors, financial services firms, and healthcare organizations.

McNair also maintains an active securities regulatory compliance practice, advising financial services clients on securities law requirements and enforcement risk across product development, distribution and operations.

He engages in pro bono work, including representing a client in federal habeas proceedings and participating in efforts to identify and remedy wrongful convictions.