William Barry is a trusted advisor to governments, boards of directors, foreign trustees, multinational companies and senior officers involved in cross-border business and the financial services industry. Mr. Barry helps solve complex problems involving multi-jurisdictional investigations, enforcement, compliance, and transactional issues so that his clients can overcome obstacles and resume focus on their business. He works with clients to address individual risks and to build credible, flexible and sustainable compliance infrastructure consistent with ESG standards.

Mr. Barry guides clients through the complex issues involved in responding to inquiries from domestic and international regulators regarding issues of accounting fraud, foreign bribery, money laundering, and other financial crimes. He represents clients faced with the challenge of responding to competing demands in parallel proceedings, such as internal reviews, government investigations, and private civil actions.

Chambers USA has described Mr. Barry as "the kind of person that everyone in the boardroom listens to" and noted he is "a very thorough thinker and very calm, and is the ideal ambassador for corporations when dealing with government agencies."
Mr. Barry is a member of the American Bar Association's International Anti-Money Laundering (AML) Committee and International Anti-Corruption Committee. He has been designated as a Certified Anti-Money Laundering Specialist by ACAMS, the Association of Certified Anti-Money Laundering Specialists.

Mr. Barry is a member of the Sustainability Accounting Review Board (SASB) Alliance.

Mr. Barry is a member of the Washington Lawyers Committee for Civil Rights and Urban Affairs, and the former Chairman of Olney Boys & Girls Club, a non-profit sports association in Maryland.