Douglas L. "Doug" Siegler

Nathaniel Edmonds serves as the Co-Chair of the firm’s litigation practice in Washington, D.C., which houses over 100 lawyers handling a variety of litigation matters, including internal corporate investigations, white collar criminal defense, anti-corruption compliance, sanctions and export controls, data privacy and cyber security, intellectual property and patent litigation, international arbitration, and antitrust counseling. Mr. Edmonds focuses on global internal investigations, in...

Harold J. Ashner is a top attorney recognized by Best Lawyers in the practice area(s) of Employee Benefits (ERISA) Law. Harold J., who practices law in Washington, District of Columbia, has been recognized since 2016. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Harold J. is held by other top lawyers in the same geographic and legal practice area.

Mary Ann Mancini's practice focuses on advising high net worth families and individuals who reside in the United States and internationally. Her clients include leaders of Fortune 100 companies and their families, as well as families whose wealth is more privately held and, in many cases, based on real estate ownership. Mary Ann counsels her clients on all matters that affect their estates, including the structuring and formation of entities, the creation of irrevocable “dynasty” ...

Michal Shinnar is a top attorney recognized by Best Lawyers in the practice area(s) of Civil Rights Law, Employment Law - Individuals and Litigation - Labor and Employment. Michal, who practices law in Greenbelt, Maryland, has been recognized since 2026. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Michal is held by other top lawyers in the same geographic and legal practice area.

John McBride’s effectiveness as a land use attorney is built upon his accumulated experience; established reputation among staff and elected officials throughout localities in Northern Virginia; and an ability to build consensus through factual, detailed presentation of information. Prior to attending law school, John worked as a City Planner, a land acquisition and right-of-way agent, and a real estate leasing agent for local governments in Northern Virginia. This decade of experience ...

Mark L. Whitaker is a top attorney recognized by Best Lawyers in the practice area(s) of Litigation - Intellectual Property. Mark L., 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 Mark L. is held by other top lawyers in the same geographic and legal practice area.

Joel Swearingen is an associate in the firm’s Project Finance and Public Finance practice group, representing issuers, underwriters, and borrowers on a variety of public finance transactions. He also has substantial experience in the field of tax withholding and information reporting, both internationally and domestically. What do you focus on? My practice includes representing clients on tax matters present in connection with public finance transactions. I also advise clients on the in...

Marcus Owens represents a broad range of nonprofit organizations, including private foundations, charities, lobbying/political organizations and trade associations. The context has ranged from tax planning, the process of formation and application for exemption, through IRS and state attorney general investigations, including complex audits by IRS Exempt Organizations Financial Investigative Units. Marcus’ focus includes executive compensation, excess benefit and self-dealing excise tax...

Jeffrey L. Steiner is a top attorney recognized by Best Lawyers in the practice area(s) of Derivatives and Futures Law. Jeffrey L., 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 Jeffrey L. is held by other top lawyers in the same geographic and legal practice area.

Paula Calimafde chairs the firm’s Retirement Plans , Employee Benefits and Government Relations practice groups and is also a senior member of the Estate Planning , Tax and Nonprofit groups. She has more than 35 years of experience advising companies and tax-exempt organizations on qualified and non-qualified retirement plans and employee benefits, including non-qualified deferred compensation, welfare benefit and cafeteria plans. She is a nationally recognized leader in the field of cr...