Jeffrey Bossert Clark - Partner

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Jeffrey Bossert Clark

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Washington, D.C.
Phone: +1 202-879-5960
Fax: +1 202-879-5200
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Professional Profile

Mr. Clark is a partner of the Firm, resident in the Washington, D.C. office. He is a complex trial and appellate litigator with especially deep experience in administrative law, cutting across dozens of statutes and numerous agencies. Mr. Clark has been with the Firm since 1996, with the exception of his period of service by virtue of appointment by the Attorney General in the U.S. Department of Justice from 2001-2005. He has worked on cutting-edge cases in numerous areas of law, and argued and won numerous cases in multiple Circuits.

Mr. Clark is rated "AV preeminent" 5.0 out of 5 by Martindale Hubbell ("the highest level of professional excellence").

From 2001 to 2005, Mr. Clark was the Deputy Assistant Attorney General for the Environment and Natural Resources Division of the Justice Department. While there, he supervised the Appellate Section (50 lawyers and staff) and the Indian Resources Section (25 lawyers and staff). Also during that period, he reviewed, edited, or contributed to virtually every brief the Environment Division of the Department of Justice filed in the Courts of Appeals, including several cases of exceptional significance he personally briefed and argued. He also worked on every Supreme Court environmental or natural resource case during this same period.

Mr. Clark's practice operates at all levels — appellate litigation, trial court litigation, agency proceedings, and regulatory and litigation counseling.

Substantively, Mr. Clark has experience with antitrust, bankruptcy, communications, complex civil litigation, constitutional law, class actions, environmental, intellectual property, and labor. For instance, in the environmental area, he has extensive experience involving the Clean Air Act, Clean Water Act, NEPA, the Energy Policy and Conservation Act of 1975, and the Energy Independence and Security Act of 2007, among many others.

Memberships & Affiliations

Elected Member of the Governing Council of the ABA Administrative Law Section (2012–2015).

Other Distinctions

Highlighted as part of Kirkland's "Tier 1" Product Liability, Mass Tort and Class Action: Toxic Tort -- Defense in the Legal 500 in 2017.

Member, The National Association of Distinguished Counsel — Nation's One Percent

Named to Super Lawyers for 2014, 2015 and 2016

Named to the Legal Who’s Who: Environmental Law List in Corporate Responsibility Magazine's January/February 2014 edition.

As part of Kirkland's "Tier 1" environmental litigation practice, The Legal 500 U.S. noted in 2011 that clients touted Mr. Clark's "experience in administrative law," calling him a "super lawyer." In 2012, The Legal 500 U.S. praised Mr. Clark's "experience in air quality matters, and [noted he] is valued as 'very responsive to client needs.'" And in 2015, The Legal 500 U.S. touted his “win in a multibillion-dollar appeal brought by 11 Louisiana parishes” for BP in a case that he briefed and argued in the Fifth Circuit.

Recipient of the Kirkland & Ellis 2010 Washington Pro Bono Service award.

Recipient of two awards in 2005 for assisting in defending military readiness in the courts, from the Department of Defense's General Counsel and Undersecretary of Defense for Personnel and Readiness, respectively.

Recipient of the National Oceanic and Atmospheric Administration's General Counsel's Award for excellence in 2003.


Co-authored with Tefft Smith, 1997 and 1998 update chapters on Restraints of Trade for the ABA's Antitrust Law Developments 4th

Authored annual update to "Procedural Means of Enforcement under 42 U.S.C 1983," 82 Geo. L. J. 1402 (1994)


Have given numerous speeches, written multiple articles, and participated in many panels on topics in energy efficiency, clean air and water law, administrative law, and constitutional law.

Most recently:


United States Supreme Court, Most Circuit Courts of Appeal, the United States District Courts for the Districts of Nebraska, the District of Columbia and the Eastern District of Texas, and the United States Court of Federal Claims
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