Aaron S. Book

Joanna Kerpen is a top attorney recognized by Best Lawyers in the practice area(s) of Employee Benefits (ERISA) Law. Joanna, 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 Joanna is held by other top lawyers in the same geographic and legal practice area.

Conflict is at the core of many divorces and can produce volatile emotions. Divorcing clients appreciate the combination of strength and compassion Katherine brings to her cases, especially when substance abuse, mental illness, domestic violence or contested child custody issues are involved. Katherine firmly believes in putting the children first in every divorce situation and in trying to reduce conflict between divorcing parents. A skilled problem-solver, Katherine acts decisively on behal...

Richard’s multinational clients benefit from his extensive experience with tax planning and controversy and trust his guidance to resolve challenging transfer-pricing issues as well as to develop, implement, and defend tax-efficient cross-border structures. For more than 25 years, he has advised clients on tax matters, with a focus on transfer pricing. Richard’s international clients span multiple industries, including transportation, finance, hospitality, electronics, food and be...

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

William (Tom) Thompson has specialized in government contract law and construction litigation for more than 40 years. Tom has represented a broad range of Government contractors (major defense contractors, information technology and systems integration contractors, construction contractors, etc.). His clients have ranged from multibillion-dollar contractors to start-up companies. This representation has included advice on federal cost principles and cost accounting requirements, and complianc...

Stephan E. Becker is a top attorney recognized by Best Lawyers in the practice area(s) of International Trade and Finance Law. Stephan 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 Stephan E. is held by other top lawyers in the same geographic and legal practice area.

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

William J. Cople III defends government contractors and commercial companies in a range of critical industries in government investigations, litigation, trials, and prosecutions involving the False Claims Act, Anti-Kickback statute, and Foreign Corrupt Practices Act, and handles corporate internal investigations, whistleblower claims, and Congressional investigations. He represents pharmaceutical, medical device, financial institution, and engineering and construction firms as trial counsel i...

Alice G. Haase is a top attorney recognized by Best Lawyers in the practice area(s) of Land Use and Zoning Law and Real Estate Law. Alice G., who practices law in Arlington, Virginia, has been recognized since 2018. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Alice G. is held by other top lawyers in the same geographic and legal practice area.

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 ...