Mark S. Levinstein

Brian E. Hayes is a top attorney recognized by Best Lawyers in the practice area(s) of Labor Law - Management. Brian E., 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 Brian E. is held by other top lawyers in the same geographic and legal practice area.

John D. Seiver is a top attorney recognized by Best Lawyers in the practice area(s) of Communications Law. John 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 John D. is held by other top lawyers in the same geographic and legal practice area.

C. Sei-Hee Arii is a top attorney recognized by Best Lawyers in the practice area(s) of DUI / DWI Defense. C. Sei-Hee, who practices law in Rockville, Maryland, has been recognized since 2026. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which C. Sei-Hee is held by other top lawyers in the same geographic and legal practice area.

Debra A. Harrison is a top attorney recognized by Best Lawyers in the practice area(s) of Energy Law. Debra A., 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 Debra A. is held by other top lawyers in the same geographic and legal practice area.

Michael D. Hausfeld is a top attorney recognized by Best Lawyers in the practice area(s) of Antitrust Law and Litigation - Antitrust. Michael D., who practices law in Washington, District of Columbia, has been recognized since 2006. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Michael D. is held by other top lawyers in the same geographic and legal practice area.

Diara M. Holmes serves as co-chair of the firm's Tax-Exempt Organizations Practice. She counsels tax-exempt organizations, including large public charities; colleges, universities and other higher education organizations; foreign charities and their U.S. affiliates; associations; government instrumentalities; social welfare organizations; and religious organizations on a broad range of tax compliance and governance issues. She advises nonprofit and for-profit organizations on structuring a va...

Andrew M. Adelman is a Senior Associate with Correia & Puth, PLLC and represents employees in all aspects of the firm’s employment litigation practice, including sex discrimination, whistleblower retaliation, and disability discrimination. Mr. Adelman’s practice is exclusively dedicated to advocating for the rights of employees, and he regularly represents employees in discrimination, retaliation, and whistleblower cases in federal and state court. Areas of Focus Mr. Adelman h...

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.

Kerry Alan Scanlon is a top attorney recognized by Best Lawyers in the practice area(s) of Litigation - Labor and Employment. Kerry Alan, who practices law in Washington, District of Columbia, has been recognized since 2024. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Kerry Alan is held by other top lawyers in the same geographic and legal practice area.

Dennis O. Garris is partner-in-charge of the firm’s Washington, D.C. office and is the former co-head of the firm’s securities, mergers and acquisitions practices. His practice focuses on securities and complex Securities and Exchange Commission (SEC) regulatory and disclosure matters and mergers and acquisitions. Mr. Garris is a nationally known expert on SEC regulatory matters, including the proxy rules, tender offer rules, going-private rules and beneficial ownership reporting ...