David A. O'Neil

Caitlin Grant is a top attorney recognized by Best Lawyers in the practice area(s) of Commercial Litigation. Caitlin, who practices law in Bethesda, Maryland, has been recognized since 2023. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Caitlin is held by other top lawyers in the same geographic and legal practice area.

David Ault is a top attorney recognized by Best Lawyers in the practice area(s) of Health Care Law. David, 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 David is held by other top lawyers in the same geographic and legal practice area.

Eric Zimmerman is a recognized Medicare law and policy authority and registered lobbyist who represents clients before Congress and administrative agencies, and helps clients navigate federal legislative and regulatory processes related to Medicare coverage, coding, reimbursement and compliance. He primarily counsels and represents hospitals and health systems, ambulatory surgery centers, clinical laboratories, pharmaceutical, biotechnology and device manufacturers and suppliers, medical trad...

Komal Khan is a top attorney recognized by Best Lawyers in the practice area(s) of Family Law. Komal, who practices law in Vienna, Virginia, has been recognized since 2025. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Komal is held by other top lawyers in the same geographic and legal practice area.

Solomon L. Wisenberg is a top attorney recognized by Best Lawyers in the practice area(s) of Criminal Defense: White-Collar. Solomon L., 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 Solomon L. is held by other top lawyers in the same geographic and legal practice area.

Roy Shannon is a top attorney recognized by Best Lawyers in the practice area(s) of Land Use and Zoning Law, Litigation - Land Use and Zoning, Litigation - Real Estate and Real Estate Law. Roy, who practices law in Alexandria, Virginia, has been recognized since 2024. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Roy is held by other top lawyers in the same geographic and legal practice area.

Ruth Wimer is a top attorney recognized by Best Lawyers in the practice area(s) of Employee Benefits (ERISA) Law. Ruth, who practices law in Washington, District of Columbia, has been recognized since 2022. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Ruth is held by other top lawyers in the same geographic and legal practice area.

Edward C. O'Callaghan is a top attorney recognized by Best Lawyers in the practice area(s) of Criminal Defense: White-Collar. Edward C., who practices law in Washington, District of Columbia, has been recognized since 2013. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Edward C. is held by other top lawyers in the same geographic and legal practice area.

Dennis Russell Hughes is a top attorney recognized by Best Lawyers in the practice area(s) of Real Estate Law. Dennis Russell, who practices law in Washington, District of Columbia, has been recognized since 2018. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Dennis Russell is held by other top lawyers in the same geographic and legal practice area.

Sanford K. Ain is a top attorney recognized by Best Lawyers in the practice area(s) of Family Law and Real Estate Law. Sanford K., who practices law in Washington, District of Columbia, has been recognized since 1983. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Sanford K. is held by other top lawyers in the same geographic and legal practice area.