William A. "Bill" Williams

Matthew D. Berkowitz is a top attorney recognized by Best Lawyers in the practice area(s) of Commercial Litigation and Mass Tort Litigation / Class Actions - Defendants. Matthew D., who practices law in Washington, District of Columbia, has been recognized since 2023. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Matthew D. is held by other top lawyers in the same geographic and legal practice area.

Carl C. Risch is a top attorney recognized by Best Lawyers in the practice area(s) of Immigration Law. Carl C., who practices law in Washington, District of Columbia, has been recognized since 2026. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Carl C. is held by other top lawyers in the same geographic and legal practice area.

Michael A. Branca is Co-Managing Partner of Peckar & Abramson’s Washington, D.C. office and serves on the firm’s Executive Committee. He focuses his practice on construction and government contract law. Mike routinely represents general and prime contractors, construction managers, and other members of the construction and government contract industries. Given his depth of experience, he is able to provide an impressive range of services to his clients, including the review an...

Mr. Cassidy focuses on legal issues raised by cross-border business transactions, including antidumping and countervailing duty proceedings, economic sanctions, export controls and customs issues. He is experienced in devising strategies for using trade law procedures, such as the antidumping laws, to achieve business objectives and in resolving disputes between companies and the US government arising from sanctions, export controls and customs laws. Mr. Cassidy served as General Counsel of t...

Nancy C. Libin is a top attorney recognized by Best Lawyers in the practice area(s) of Privacy and Data Security Law. Nancy C., who practices law in Washington, District of Columbia, has been recognized since 2025. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Nancy C. is held by other top lawyers in the same geographic and legal practice area.

Ms. Knapp is a partner at Shounbach having joined the firm in 2013. Her legal career has been dedicated entirely to the practice of family law since completing a two year judicial clerkship with the Honorable William D. Hamblen (Ret.) in Prince William County Circuit Court. Ms. Knapp graduated from George Mason University School of Law 2011, however, law is a second career for Ms. Knapp. Prior to law school, she worked in public and media relations for six years, gaining oral and written advo...

Scott H. Segal is a top attorney recognized by Best Lawyers in the practice area(s) of Environmental Law. Scott H., who practices law in Washington, District of Columbia, has been recognized since 2020. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Scott H. is held by other top lawyers in the same geographic and legal practice area.

Hans P. Dyke is a top attorney recognized by Best Lawyers in the practice area(s) of Energy Law. Hans P., who practices law in Washington, District of Columbia, has been recognized since 2021. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Hans P. is held by other top lawyers in the same geographic and legal practice area.

Paul Oosterhuis is a senior international tax partner representing clients on a wide range of international and U.S. tax matters. Mr. Oosterhuis has extensive experience in international mergers and acquisitions, post-acquisition integration transactions, spin-offs, internal restructurings and joint venture transactions. He also represents multinational companies in nontransactional international tax planning and IRS controversy matters. In recent transactions, Mr. Oosterhuis has represented:...

Kevin P. O’Brien is a partner in the firm’s Employee Benefits and Executive Compensation practice. His practice has concentrated in employee compensation and benefits for over 30 years. Kevin is widely known as a leader in a wide variety of subjects, including innovative defined benefit plan design, flexible benefits, ERISA fiduciary matters and executive compensation. Before joining the firm, Kevin worked in the Pension and Welfare Benefits Administration at the Labor Department ...