Assistant Attorney General, Environment and Natural Resources Division, U.S. Department of Justice
Jeffrey Bossert Clark was born in Philadelphia, Pennsylvania on April 17, 1967. He is a graduate of Harvard University (A.B. in economics and history, 1989), the University of Delaware (M.A. in urban affairs and public policy, 1993), and the Georgetown University Law Center (J.D., 1995).
Mr. Clark began his career working for the State of Delaware’s Department of Finance, Division of Revenue as an economics analyst in the field of tax policy. During his tenure from 1989 to 1992, he authored several white papers analyzing Delaware revenue sources. Delaware also selected Mr. Clark to submit an economic report and affidavit to the United States Supreme Court in the original jurisdiction case of Delaware v. New York, 507 U.S. 490 (1993).
He entered Georgetown’s law school in 1992 where he earned honors as an articles editor of the Georgetown Law Journal, an Olin Law & Economics Fellow, and a member of the Order of the Coif. From 1995 to 1996, Mr. Clark clerked for Judge Boggs of the U.S. Court of Appeals of the Sixth Circuit. Mr. Clark then joined the law firm of Kirkland & Ellis as an associate from 1996-2001. He worked as an appellate litigator on numerous Supreme Court and other appellate cases and developed expertise in administrative law, statutory interpretation, as well as antitrust, labor, environmental, and telecommunications law.
Mr. Clark went on to serve in ENRD from 2001-2005 as a Deputy Assistant Attorney General selected by Attorney General Ashcroft and Assistant Attorney General Tom Sansonetti. In that capacity, he supervised ENRD’s Appellate and Indian Resources Sections. He reviewed, edited, and contributed to virtually every brief that ENRD filed in the Courts of Appeals, including several cases of exceptional significance that he personally briefed and argued. During his service in the early 2000s, Mr. Clark argued and won numerous cases in multiple U.S. Courts of Appeals and worked on all Supreme Court cases arising out of ENRD’s work.
In 2005, Mr. Clark returned to Kirkland & Ellis LLP as a partner, where he litigated until his return to ENRD in 2018. There he worked on numerous multi-billion-dollar matters and continued to argue many appellate cases. His practice operated at all levels — appellate litigation, trial court litigation, agency proceedings, and regulatory and litigation counseling. He has been named a Super Lawyer for multiple years running, highlighted in the Legal 500, named to the “Legal Who’s Who for Environmental Law” in Corporate Responsibility Magazine, rated A.V. preeminent by Martindale Hubbell, and named a member of the National Association of Distinguished Counsel’s Nation’s One Percent. He also was named one of America’s Top 100 High Stakes Litigators.
President Trump nominated Mr. Clark to be the Assistant Attorney General of the Environment and Natural Resources Division (ENRD) on June 7, 2017. He was confirmed by the U.S. Senate on October 11, 2018 and sworn into office on November 1, 2018, followed by an investiture ceremony on November 15, 2018.
Partner, Donahue & Goldberg LLP
Sean H. Donahue's practice is focused on appellate litigation, including environmental cases in federal and state appellate courts, legal counseling, and helping clients communicate effectively to courts, agencies, and other audiences. He is a member of the bars of the District of Columbia and the State of California.
A 1992 graduate of University of Chicago Law School, Sean served as law clerk to Ruth Bader Ginsburg, then of the U.S. Court of Appeals for the D.C. Circuit, and to Justice John Paul Stevens. He entered private practice at Jenner & Block's Washington office, where he worked on civil matters including in telecommunications and First Amendment law. He then spent four years at the Department of Justice, Environmental and Natural Resources Division, Appellate Section, briefing and arguing cases in the United States Courts of Appeals, and state supreme courts concerning federal environmental and natural resources law, federal property law, takings, and Indian law.
Sean has argued approximately 50 cases in federal and state appellate courts. Since first establishing his own practice in 2002, he has represented environmental and public health organization parties in numerous major environmental and clean energy cases in the Supreme Court and the courts of appeals. His current practice includes representation of public interest organizations, governmental bodies, and private entities in environmental, energy, natural resources, and other cases. Sean has taught courses in environmental law, civil procedure, constitutional law and other subjects at Washington & Lee University School of Law, Iowa College of Law, and Georgetown University Law Center, and currently teaches climate change law and policy as a lecturer at Stanford Law School. He has given presentations at law schools including Berkeley, Columbia, Fordham, Harvard, Duke, Georgetown, Maryland, NYU, Northwestern, Stanford, University of Chicago, University of Florida, Vermont Law School, and Washington & Lee.
Senior Fellow, Center for Energy and Environment, Competitive Enterprise Institute
Marlo Lewis, Jr. is a Senior Fellow at the Competitive Enterprise Institute, where he writes on global warming, energy policy, and other public policy issues. Prior to joining CEI in April 2002, he served as Director of External Relations at the Reason Foundation in Los Angeles, California. During the 106th Congress, Marlo served as Staff Director of the House Government Reform Subcommittee on National Economic Growth, Natural Resources, and Regulatory Affairs.
His interests include the science, economics, and politics of global warming policy; the precautionary principle; environmentalism and religion; and the moral basis of free enterprise. Marlo has been published in The Washington Times, Investors Business Daily, TechCentralStation, National Review, and Interpretation: A Journal of Political Philosophy. He has appeared on various television and radio programs, and his ideas have been featured in radio commentary by Rush Limbaugh and G. Gordon Liddy.
Before joining CEI for his first tenure with the organization in 1993, Marlo served as Research Director for the grassroots organization, Citizens Against Government Waste. Earlier, he was a Staff Consultant to the House Foreign Affairs Subcommittee on International Economic Policy and Trade, a Special Assistant at the State Department Bureau of Inter-American Affairs and Bureau of International Organization Affairs, and a Visiting Assistant Professor of Political Science at Claremont McKenna College. He holds a Ph.D. in Government from Harvard University and a B.A. in Political Science from Claremont McKenna College.
Executive Vice President, The Federalist Society
Dean Reuter is Executive Vice President at the Federalist Society for Law and Public Policy Studies. He has served in two federal government agency Offices of the Inspector General, as Counsel to the Inspector General and Deputy Inspector General, responsible for policing the use of federal funds granted and contracted through those agencies. As such, he helped conduct and oversee criminal investigations across the country. He is the principal author of the non-fiction book, The Hidden Nazi: The Untold Story of America's Deal with the Devil, and editor of Liberty’s Nemesis: The Unchecked Expansion of the State and Confronting Terror: 9/11 and the Future of American National Security. He was appointed by the President and served as Vice-Chairman of the Board of Directors of the Corporation for National and Community Service, and recently served as an appointee on the U.S. Commission on Presidential Scholars. He is a graduate of Hood College (BA with Honors) and the University of Maryland School of Law.
Senior Counsel, Becket Fund for Religious Liberty
William J. Haun is Senior Counsel at the Becket Fund for Religious Liberty and a Nonresident Fellow at the American Enterprise Institute (AEI). At Becket, Will litigates nationwide in defense of religious liberty for all faith traditions, particularly before the U.S. Supreme Court and in other federal and state appellate courts. His litigation includes being a member of the U.S. Supreme Court team that prevailed 9-0 for Catholic Social Services in Fulton v. City of Philadelphia, arguing before multiple federal appellate courts, federal district courts, and the Supreme Court of Texas. At AEI, Will writes and researches on constitutionalism and self-government’s prerequisites, especially the role of religion in securing and preserving freedom.
Before joining Becket and AEI, Will practiced appellate and antitrust law at two international law firms—Shearman & Sterling and Hunton & Williams. He also served as a law clerk to Judge Janice Rogers Brown of the U.S. Court of Appeals for the D.C. Circuit and Judge Claude Hilton of the U.S. District Court for the Eastern District of Virginia. Will often writes on constitutional law issues, including in the Harvard Journal of Law & Public Policy, the Catholic University Law Review, National Affairs, Law & Liberty, National Review Online, the Wall Street Journal, and the Washington Post. He also speaks on these topics, including at the Catholic University of America, Columbus School of Law, Princeton University, the University of Virginia School of Law, and the University of Chicago Law School. He received his J.D. from the Catholic University of America, cum laude, where he was a published member of the Law Review. He received his B.A. from American University in political science, cum laude. He lives in Maryland with his wife and children, where they enjoy sailing, cheering on their favorite baseball teams, and discovering the great traditions of their Catholic faith.
Partner, Baker & Hostetler LLP
Mark DeLaquil is a first-chair trial and appellate advocate who focuses on complex environmental and regulatory proceedings, First Amendment practice and political law.
Mark has been recognized by Chambers USA for environmental litigation (2015 to 2024) and has been named by Law360 as one of the "Top 5 Environmental Attorneys Under the Age of 40" on two occasions.
Executive Vice President, The Federalist Society
Dean Reuter is Executive Vice President at the Federalist Society for Law and Public Policy Studies. He has served in two federal government agency Offices of the Inspector General, as Counsel to the Inspector General and Deputy Inspector General, responsible for policing the use of federal funds granted and contracted through those agencies. As such, he helped conduct and oversee criminal investigations across the country. He is the principal author of the non-fiction book, The Hidden Nazi: The Untold Story of America's Deal with the Devil, and editor of Liberty’s Nemesis: The Unchecked Expansion of the State and Confronting Terror: 9/11 and the Future of American National Security. He was appointed by the President and served as Vice-Chairman of the Board of Directors of the Corporation for National and Community Service, and recently served as an appointee on the U.S. Commission on Presidential Scholars. He is a graduate of Hood College (BA with Honors) and the University of Maryland School of Law.
Senior Counsel, Becket Fund for Religious Liberty
William J. Haun is Senior Counsel at the Becket Fund for Religious Liberty and a Nonresident Fellow at the American Enterprise Institute (AEI). At Becket, Will litigates nationwide in defense of religious liberty for all faith traditions, particularly before the U.S. Supreme Court and in other federal and state appellate courts. His litigation includes being a member of the U.S. Supreme Court team that prevailed 9-0 for Catholic Social Services in Fulton v. City of Philadelphia, arguing before multiple federal appellate courts, federal district courts, and the Supreme Court of Texas. At AEI, Will writes and researches on constitutionalism and self-government’s prerequisites, especially the role of religion in securing and preserving freedom.
Before joining Becket and AEI, Will practiced appellate and antitrust law at two international law firms—Shearman & Sterling and Hunton & Williams. He also served as a law clerk to Judge Janice Rogers Brown of the U.S. Court of Appeals for the D.C. Circuit and Judge Claude Hilton of the U.S. District Court for the Eastern District of Virginia. Will often writes on constitutional law issues, including in the Harvard Journal of Law & Public Policy, the Catholic University Law Review, National Affairs, Law & Liberty, National Review Online, the Wall Street Journal, and the Washington Post. He also speaks on these topics, including at the Catholic University of America, Columbus School of Law, Princeton University, the University of Virginia School of Law, and the University of Chicago Law School. He received his J.D. from the Catholic University of America, cum laude, where he was a published member of the Law Review. He received his B.A. from American University in political science, cum laude. He lives in Maryland with his wife and children, where they enjoy sailing, cheering on their favorite baseball teams, and discovering the great traditions of their Catholic faith.
Senior Attorney, Pacific Legal Foundation
Damien Schiff is a senior attorney at Pacific Legal Foundation. He leads its environmental practice group, a unique initiative that draws broadly from PLF’s expertise and success in property rights and separation of powers litigation. Over the years, Damien has represented hundreds of landowners and property rights advocates to defend their liberties against heavy-handed and unwarranted environmental and land-use regulation. His litigation experience includes Sackett v. U.S. Environmental Protection Agency, a groundbreaking decision in which the U.S. Supreme Court upheld the right of landowners to challenge Clean Water Act compliance orders issued by EPA, and Contoski v. Norton, PLF’s successful effort to force the federal government to make good on its promise to delist the bald eagle from the Endangered Species Act.
Besides litigation, Damien has written academic articles on a variety of subjects, including the Endangered Species Act, the Clean Water Act, greenhouse gas torts, the duty to rescue, and international water law. He has appeared on a variety of television and radio programs and has been quoted in The New York Times, The Wall Street Journal, Harper’s Magazine, and The Economist, among other publications.
He obtained his law degree magna cum laude from the University of San Diego School of Law, and his undergraduate degree magna cum laude from Georgetown University. While at USD, he was a research assistant for Professor Bernard Siegan, a leading constitutional theorist and advocate for property rights and economic liberty. Immediately prior to joining PLF, Damien clerked for Judge (and former PLF attorney) Victor Wolski of the United States Court of Federal Claims. Damien credits the mentoring and examples of Professor Siegan and Judge Wolski for his decision to pursue a career in liberty-based public interest litigation.
Damien lives in Sacramento with his wife, two young sons, four chickens, and a cat named Princess. In his off hours he enjoys stamp collecting, Gregorian chant, and martinis—preferably at the same time.
Partner, Wiley Rein, LLP
Megan L. Brown is a partner at Wiley Rein LLP. She has significant litigation, appellate and regulatory experience before state and federal courts and agencies.
Ms. Brown helps businesses respond to federal, state and local regulation and investigations raising administrative law, statutory interpretation, and constitutional issues, including the First Amendment.
Executive Vice President and General Counsel, Battery Council International
Clinical Professor of Law, Dale E. Fowler School of Law, Chapman University
Senior Fellow, Center for Energy and Environment, Competitive Enterprise Institute
Marlo Lewis, Jr. is a Senior Fellow at the Competitive Enterprise Institute, where he writes on global warming, energy policy, and other public policy issues. Prior to joining CEI in April 2002, he served as Director of External Relations at the Reason Foundation in Los Angeles, California. During the 106th Congress, Marlo served as Staff Director of the House Government Reform Subcommittee on National Economic Growth, Natural Resources, and Regulatory Affairs.
His interests include the science, economics, and politics of global warming policy; the precautionary principle; environmentalism and religion; and the moral basis of free enterprise. Marlo has been published in The Washington Times, Investors Business Daily, TechCentralStation, National Review, and Interpretation: A Journal of Political Philosophy. He has appeared on various television and radio programs, and his ideas have been featured in radio commentary by Rush Limbaugh and G. Gordon Liddy.
Before joining CEI for his first tenure with the organization in 1993, Marlo served as Research Director for the grassroots organization, Citizens Against Government Waste. Earlier, he was a Staff Consultant to the House Foreign Affairs Subcommittee on International Economic Policy and Trade, a Special Assistant at the State Department Bureau of Inter-American Affairs and Bureau of International Organization Affairs, and a Visiting Assistant Professor of Political Science at Claremont McKenna College. He holds a Ph.D. in Government from Harvard University and a B.A. in Political Science from Claremont McKenna College.
Partner, Wiley Rein, LLP
Megan L. Brown is a partner at Wiley Rein LLP. She has significant litigation, appellate and regulatory experience before state and federal courts and agencies.
Ms. Brown helps businesses respond to federal, state and local regulation and investigations raising administrative law, statutory interpretation, and constitutional issues, including the First Amendment.
Partner, Baker & Hostetler LLP
Mark DeLaquil is a first-chair trial and appellate advocate who focuses on complex environmental and regulatory proceedings, First Amendment practice and political law.
Mark has been recognized by Chambers USA for environmental litigation (2015 to 2024) and has been named by Law360 as one of the "Top 5 Environmental Attorneys Under the Age of 40" on two occasions.
Senior Counsel, Becket Fund for Religious Liberty
William J. Haun is Senior Counsel at the Becket Fund for Religious Liberty and a Nonresident Fellow at the American Enterprise Institute (AEI). At Becket, Will litigates nationwide in defense of religious liberty for all faith traditions, particularly before the U.S. Supreme Court and in other federal and state appellate courts. His litigation includes being a member of the U.S. Supreme Court team that prevailed 9-0 for Catholic Social Services in Fulton v. City of Philadelphia, arguing before multiple federal appellate courts, federal district courts, and the Supreme Court of Texas. At AEI, Will writes and researches on constitutionalism and self-government’s prerequisites, especially the role of religion in securing and preserving freedom.
Before joining Becket and AEI, Will practiced appellate and antitrust law at two international law firms—Shearman & Sterling and Hunton & Williams. He also served as a law clerk to Judge Janice Rogers Brown of the U.S. Court of Appeals for the D.C. Circuit and Judge Claude Hilton of the U.S. District Court for the Eastern District of Virginia. Will often writes on constitutional law issues, including in the Harvard Journal of Law & Public Policy, the Catholic University Law Review, National Affairs, Law & Liberty, National Review Online, the Wall Street Journal, and the Washington Post. He also speaks on these topics, including at the Catholic University of America, Columbus School of Law, Princeton University, the University of Virginia School of Law, and the University of Chicago Law School. He received his J.D. from the Catholic University of America, cum laude, where he was a published member of the Law Review. He received his B.A. from American University in political science, cum laude. He lives in Maryland with his wife and children, where they enjoy sailing, cheering on their favorite baseball teams, and discovering the great traditions of their Catholic faith.
Assistant Attorney General, Environment and Natural Resources Division, U.S. Department of Justice
Jeffrey Bossert Clark was born in Philadelphia, Pennsylvania on April 17, 1967. He is a graduate of Harvard University (A.B. in economics and history, 1989), the University of Delaware (M.A. in urban affairs and public policy, 1993), and the Georgetown University Law Center (J.D., 1995).
Mr. Clark began his career working for the State of Delaware’s Department of Finance, Division of Revenue as an economics analyst in the field of tax policy. During his tenure from 1989 to 1992, he authored several white papers analyzing Delaware revenue sources. Delaware also selected Mr. Clark to submit an economic report and affidavit to the United States Supreme Court in the original jurisdiction case of Delaware v. New York, 507 U.S. 490 (1993).
He entered Georgetown’s law school in 1992 where he earned honors as an articles editor of the Georgetown Law Journal, an Olin Law & Economics Fellow, and a member of the Order of the Coif. From 1995 to 1996, Mr. Clark clerked for Judge Boggs of the U.S. Court of Appeals of the Sixth Circuit. Mr. Clark then joined the law firm of Kirkland & Ellis as an associate from 1996-2001. He worked as an appellate litigator on numerous Supreme Court and other appellate cases and developed expertise in administrative law, statutory interpretation, as well as antitrust, labor, environmental, and telecommunications law.
Mr. Clark went on to serve in ENRD from 2001-2005 as a Deputy Assistant Attorney General selected by Attorney General Ashcroft and Assistant Attorney General Tom Sansonetti. In that capacity, he supervised ENRD’s Appellate and Indian Resources Sections. He reviewed, edited, and contributed to virtually every brief that ENRD filed in the Courts of Appeals, including several cases of exceptional significance that he personally briefed and argued. During his service in the early 2000s, Mr. Clark argued and won numerous cases in multiple U.S. Courts of Appeals and worked on all Supreme Court cases arising out of ENRD’s work.
In 2005, Mr. Clark returned to Kirkland & Ellis LLP as a partner, where he litigated until his return to ENRD in 2018. There he worked on numerous multi-billion-dollar matters and continued to argue many appellate cases. His practice operated at all levels — appellate litigation, trial court litigation, agency proceedings, and regulatory and litigation counseling. He has been named a Super Lawyer for multiple years running, highlighted in the Legal 500, named to the “Legal Who’s Who for Environmental Law” in Corporate Responsibility Magazine, rated A.V. preeminent by Martindale Hubbell, and named a member of the National Association of Distinguished Counsel’s Nation’s One Percent. He also was named one of America’s Top 100 High Stakes Litigators.
President Trump nominated Mr. Clark to be the Assistant Attorney General of the Environment and Natural Resources Division (ENRD) on June 7, 2017. He was confirmed by the U.S. Senate on October 11, 2018 and sworn into office on November 1, 2018, followed by an investiture ceremony on November 15, 2018.
Partner, Donahue & Goldberg LLP
Sean H. Donahue's practice is focused on appellate litigation, including environmental cases in federal and state appellate courts, legal counseling, and helping clients communicate effectively to courts, agencies, and other audiences. He is a member of the bars of the District of Columbia and the State of California.
A 1992 graduate of University of Chicago Law School, Sean served as law clerk to Ruth Bader Ginsburg, then of the U.S. Court of Appeals for the D.C. Circuit, and to Justice John Paul Stevens. He entered private practice at Jenner & Block's Washington office, where he worked on civil matters including in telecommunications and First Amendment law. He then spent four years at the Department of Justice, Environmental and Natural Resources Division, Appellate Section, briefing and arguing cases in the United States Courts of Appeals, and state supreme courts concerning federal environmental and natural resources law, federal property law, takings, and Indian law.
Sean has argued approximately 50 cases in federal and state appellate courts. Since first establishing his own practice in 2002, he has represented environmental and public health organization parties in numerous major environmental and clean energy cases in the Supreme Court and the courts of appeals. His current practice includes representation of public interest organizations, governmental bodies, and private entities in environmental, energy, natural resources, and other cases. Sean has taught courses in environmental law, civil procedure, constitutional law and other subjects at Washington & Lee University School of Law, Iowa College of Law, and Georgetown University Law Center, and currently teaches climate change law and policy as a lecturer at Stanford Law School. He has given presentations at law schools including Berkeley, Columbia, Fordham, Harvard, Duke, Georgetown, Maryland, NYU, Northwestern, Stanford, University of Chicago, University of Florida, Vermont Law School, and Washington & Lee.
Senior Fellow, Center for Energy and Environment, Competitive Enterprise Institute
Marlo Lewis, Jr. is a Senior Fellow at the Competitive Enterprise Institute, where he writes on global warming, energy policy, and other public policy issues. Prior to joining CEI in April 2002, he served as Director of External Relations at the Reason Foundation in Los Angeles, California. During the 106th Congress, Marlo served as Staff Director of the House Government Reform Subcommittee on National Economic Growth, Natural Resources, and Regulatory Affairs.
His interests include the science, economics, and politics of global warming policy; the precautionary principle; environmentalism and religion; and the moral basis of free enterprise. Marlo has been published in The Washington Times, Investors Business Daily, TechCentralStation, National Review, and Interpretation: A Journal of Political Philosophy. He has appeared on various television and radio programs, and his ideas have been featured in radio commentary by Rush Limbaugh and G. Gordon Liddy.
Before joining CEI for his first tenure with the organization in 1993, Marlo served as Research Director for the grassroots organization, Citizens Against Government Waste. Earlier, he was a Staff Consultant to the House Foreign Affairs Subcommittee on International Economic Policy and Trade, a Special Assistant at the State Department Bureau of Inter-American Affairs and Bureau of International Organization Affairs, and a Visiting Assistant Professor of Political Science at Claremont McKenna College. He holds a Ph.D. in Government from Harvard University and a B.A. in Political Science from Claremont McKenna College.
Greenhouse Gases: Massachusetts v. EPA Revisited - Podcast
Jeffrey Bossert Clark, Sean H. Donahue, Marlo Lewis, Dean Reuter
Starting in late 2009, the Environmental Protection Agency began issuing a series of four rules...
The EPA's Anticipated Attempt to Regulate Greenhouse Gas Emissions from Existing Power Plants - Podcast
William J. Haun, Mark DeLaquil, Dean Reuter
For roughly two decades, the bipartisan consensus of the U.S. Congress on the regulation of...
The EPA's Anticipated Attempt to Regulate Greenhouse Gas Emissions from Existing Power Plants
The Clean Air Act as an Obstacle to the Environmental Protection Agency’s Anticipated Attempt to Regulate Greenhouse Gas Emissions from Existing Power Plants
William J. Haun
For roughly two decades, the bipartisan consensus of the U.S. Congress on the regulation of...
Greenhouse Gases: Massachusetts v. EPA Revisited
Sackett v. Environmental Protection Agency: Compliance Orders and the Right of Judicial Review
Damien Michael Schiff
The United States Supreme Court’s decision in Sackett v. Environmental Protection Agency1 promises to be important...
Global Warming Nuisance Suits Given a Cool Reception in Court
Megan L. Brown, Roger H. Miksad
For the better part of a decade, courts have confronted several global warming nuisance suits...
Bounty Hunters and the Public Interest - A Study of California Proposition 65
Anthony (Tom) Caso
INTRODUCTION Adopted by California voters in 1986, Proposition 65 was a revolutionary measure in a...
EPA Regulation of Fuel Economy: Congressional Intent or Climate Coup?
Marlo Lewis
Note from the Editor:1 This paper assesses EPA’s rule setting standards for motor vehicle greenhouse...
American Electric Power Company v. Connecticut - Post-Decision SCOTUScast
Megan L. Brown
On June 20, 2011, the Supreme Court announced its decision in American Electrical Power Company...