Colleen M. Heisey

Adam S. Caldwell is a top attorney recognized by Best Lawyers in the practice area(s) of Communications Law. Adam S., 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 Adam S. is held by other top lawyers in the same geographic and legal practice area.

Jonathan S. Jeffress served the District of Columbia as an Assistant Federal Public Defender for 14 years, regularly taking on – and defeating – the Department of Justice and the U.S. Attorney’s Office in court. Jon specializes in representation for clients under investigation for alleged false statements, bribery, and campaign finance violations. Since entering private practice at Kaiser Law, Jon has worked with clients in all phases of federal criminal cases, including thr...

Paul J. Abraham is the founder and CEO of PJI Law. After growing up in Northern Virginia, Mr. Abraham earned two academic majors at Cornell University and came back to Northern Virginia to obtain a Juris Doctor degree at the George Mason University School of Law. Mr. Abraham has represented clients in trusts & estates, litigation, and business law for over 15 years. Additionally, Mr. Abraham has been an active participant in several legal pro bono programs, including the Family Legal Assi...

David G. Tewksbury focuses his practice on federal energy regulatory law, particularly as it relates to electric power. He advises independent power producers, power marketers, trade associations and others on a wide range of federal energy regulatory, markets and reliability matters. Read full biography: https://www.mwe.com/people/tewksbury-david-g/

For more information, please visit www.gibsondunn.com/lawyer/warin-f-joseph/ .

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...

Chris Leibig has practiced exclusively criminal defense since 1996. His firm has offices in Alexandria and Charlottesville. Chris is President-elect of the Virginia Association of Criminal Defense Attorneys and one of fourteen members of the Virginia Indigent Defense Commission, which oversees Virginia's Public Defender Offices. He has been a member of the National Organization for Reform of Marijuana Laws since 2006. The Law Office of Christopher Leibig represents individuals accused or bein...

James N. Mastracchio is a top attorney recognized by Best Lawyers in the practice area(s) of Tax Law. James N., 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 James N. is held by other top lawyers in the same geographic and legal practice area.

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

Lynn L. Bergeson, Managing Partner of Bergeson & Campbell, P.C. (B&C®), has earned an international reputation for her deep and expansive understanding of the Toxic Substances Control Act (TSCA), the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA), the European Union Registration, Evaluation, Authorization and Restriction of Chemicals (REACH) regulation, and especially how these regulatory programs pertain to nanotechnology, industrial biotechnology, synthetic biology,...