Adam W. Walsh

Brian D. Israel is a top attorney recognized by Best Lawyers in the practice area(s) of Environmental Law and Litigation - Environmental. Brian D., 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 Brian D. is held by other top lawyers in the same geographic and legal practice area.

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...

Sara W. Koblitz advises FDA-regulated clients on a range of issues with a particular focus on Hatch-Waxman patent and exclusivity, biosimilars, and the Orange Book. She helps drug and device manufacturers in various stages of product development and guides clients through the applicable regulatory requirements with respect to applications and submissions, device classification, potential exclusivities, promotional issues, and post-marketing requirements. Ms. Koblitz also counsels cosmetics, f...

Heidi builds on her previous experience at the Office of Counsel to the Inspector General of the Department of Health and Human Services to assist clients with health care regulatory, compliance, and fraud and abuse matters. Heidi previously served as chief of the Administrative and Civil Remedies Branch in the Office of Counsel to the Inspector General (OCIG) at the Department Health and Human Services. Heidi served as the OCIG’s coordinator for both the Provider Self-Disclosure Protoc...

Ian Paul Fisher is a top attorney recognized by Best Lawyers in the practice area(s) of Native American Law. Ian Paul, 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 Ian Paul is held by other top lawyers in the same geographic and legal practice area.

Edward Boling is a top attorney recognized by Best Lawyers in the practice area(s) of Environmental Law. Edward, 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 Edward is held by other top lawyers in the same geographic and legal practice area.

Ashley B. Sawyer is a top attorney recognized by Best Lawyers in the practice area(s) of Trusts and Estates. Ashley B., 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 Ashley B. is held by other top lawyers in the same geographic and legal practice area.

Leon Fresco is a top attorney recognized by Best Lawyers in the practice area(s) of Immigration Law. Leon, 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 Leon is held by other top lawyers in the same geographic and legal practice area.

Christian A. Buerger is a top attorney recognized by Best Lawyers in the practice area(s) of Real Estate Law. Christian A., 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 Christian A. is held by other top lawyers in the same geographic and legal practice area.

David Schertler is widely recognized as one of the top white–collar criminal defense attorneys in the Washington area and nationwide. He founded Schertler & Onorato, LLP, in 1996 and has built the firm’s reputation as a premier litigation boutique through his broad experience with criminal and civil investigative and trial matters and the results that he has achieved for his clients. Mr. Schertler is known for his skilled and tenacious representation of individuals and entitie...