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.
Judge, United States Court of Appeals, Seventh Circuit
Michael B. Brennan was confirmed and sworn in as a Circuit Judge for the U.S. Court of Appeals for the Seventh Circuit in May 2018.
He previously worked as a partner in the Milwaukee law firm of Gass Weber Mullins LLC, where he tried cases and handled appeals in federal and state courts, as a judge on the Milwaukee County Circuit, where he presided over a variety of criminal and civil calendars, and as an assistant district attorney in the Milwaukee County District Attorney’s office.
Brennan’s undergraduate degree is from the University of Notre Dame, and his law degree from Northwestern University School of Law, where he was an editor on the law review and the moot court champion. He served as a law clerk on the U.S. District Court for the Eastern District of Wisconsin and the U.S. Court of Appeals for the Seventh Circuit.
Professor of Law, Antonin Scalia Law School, George Mason University
Professor of Law Michael S. Greve joined the faculty of the Antonin Scalia Law School, George Mason University in fall 2012 after having served as John G. Searle Scholar at the American Enterprise Institute (AEI), where he specialized in constitutional law, courts, and business regulation and served as chairman of the Competitive Enterprise Institute. Prior to joining AEI, Greve was founder and co-director of the Center for Individual Rights, a public interest law firm specializing in constitutional litigation.
Greve has served previously as an adjunct professor at a number of universities, including Cornell and Johns Hopkins Universities, and has been a visiting professor at Boston College since 2004. He was awarded a PhD and an MA in government by Cornell University. Greve also earned a Diploma from the University of Hamburg in Germany.
A prolific writer, Greve is the author of nine books and a multitude of articles appearing in scholarly publications, as well as numerous editorials, short articles, and book reviews. He is a frequent speaker for professional and scholarly organizations and has made many appearances on radio and television.
In addition Greve has provided congressional and state legislative testimony, has lobbied and consulted in federal agency proceedings, and has provided litigation services and management in over 30 cases, including matters before the U.S. Supreme Court.
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.
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.
Tazewell Taylor Professor of Law and William H. Cabell Research Professor, William & Mary Law School
Jonathan H. Adler joined the William & Mary law faculty as the Tazwell Taylor Professor of Law and William H. Cabell Research Professor in 2025. Prior to joining the faculty, he was the inaugural Johan Verheij Memorial Professor of Law and the founding Director of the Coleman P. Burke Center for Environmental Law at the Case Western Reserve University School of Law.
Professor Adler is the author or editor of seven books, including Climate Liberalism: Perspectives on Liberty, Property and Pollution (Palgrave, 2023), Marijuana Federalism: Uncle Sam and Mary Jane (Brookings Institution Press, 2020), Business and the Roberts Court (Oxford University Press, 2016) and Rebuilding the Ark: New Perspectives on Endangered Species Act Reform (AEI Press, 2011).
His articles have appeared in publications ranging from the Harvard Environmental Law Review and Yale Journal on Regulation to the Wall Street Journal, New York Times, and Washington Post. He has testified before Congress a dozen times, and his work has been cited in the U.S. Supreme Court. A 2024 study identified Professor Adler as the seventh most cited legal academic in administrative and environmental law from 2019 to 2023.
Professor Adler is a contributing editor to Civitas Outlook and a regular contributor to the popular legal blog, The Volokh Conspiracy. A regular commentator on constitutional and regulatory issues, he has appeared on numerous radio and television programs, ranging from the PBS Newshour and National Public Radio to the Fox News Channel and Entertainment Tonight.
Professor Adler is a senior fellow at the Property & Environment Research Center in Bozeman, Montana. In 2018, Professor Adler was elected to membership in the American Law Institute and helped co-found the organization Checks and Balances. In 2024, Professor Adler was appointed a public member of the Administrative Conference of the United States.
Professor Adler clerked for the Honorable David B. Sentelle on the U.S. Court of Appeals for the District of Columbia Circuit.
Samuel H. McCoy II Professor of Law, University of Virginia School of Law
John F. Duffy is the Samuel H. McCoy II Professor of Law and Class of 1966 Research Professor of Law at the University of Virginia School of Law, where he teaches administrative law, torts and intellectual property. Professor Duffy has published articles on a wide range of administrative law and regulatory issues in journals such as University of Chicago Law Review, Yale Law Journal, Stanford Law Review, Virginia Law Review, Columbia Law Review, Texas Law Review, Northwestern University Law Review, NYU Law Review, University of Pennsylvania Law Review and the Supreme Court Review. His 1998 article Administrative Common Law in Judicial Review, 77 Tex. L. Rev. 113 (1998), was one of the first articles to criticize the Chevron doctrine as being irreconcilable with § 706 of the APA; it won the American Bar Association’s Scholarship Award in Administrative Law. His 2008 article “Are Administrative Patent Judges Unconstitutional?” was covered on National Public Radio), in the New York Times (Adam Liptak, In One Flaw, Questions on Validity of 46 Judges, May 6, 2008), and in the Wall Street Journal (Dan Slater, Patently Unconstitutional, May 6, 2008). The NYT and WSJ agreed that he was “a different kind of law professor,” “one of the lucky few” whose “writings actually wind up changing the law.”
As an attorney in the courts, Duffy has twice successfully convinced the Supreme Court to overturn lower court doctrines that had been applied in many cases over decades but that were unanimously held to be irreconcilable with Supreme Court precedents. See TC Heartland v. Kraft Foods Group Brands, 581 U.S. 258 (2017); KSR v. Teleflex, 550 U.S. 398 (2007).
Prior to entering legal academics, Duffy clerked on the D.C. Circuit for Stephen Williams and on the Supreme Court for Antonin Scalia. While clerking, he became known as Justice Scalia’s “hapless law clerk,” who had been tasked with unearthing three-quarters of a century of legislative history that made “no difference” to the outcome in an otherwise forgettable case. See Conroy v. Aniskoff, 507 U.S. 511, 527-28 (1993) (Scalia, J., concurring in the judgment).
In earlier days, Duffy enjoyed being a professional blackjack player unwelcome in all Atlantic City casinos and a semi-professional road runner (best marathon time 2:24:33). He holds an A.B. in physics from Harvard and a J.D. from the University of Chicago.
Partner, Marzulla Law
Roger J. Marzulla is one of the nation’s leading environmental, water, and property lawyers. As Assistant Attorney General in charge of the U.S. Justice Department’s Environment and Natural Resources Division, Roger learned first hand the operations and litigation styles of his client agencies: EPA, Interior Department, Bureau of Reclamation, Fish and Wildlife Service, National Marine Fisheries Service, Department of Transportation, Department of Commerce. In 1997, he co-founded Marzulla Law, where he brings to bear more than 35 years of expertise representing companies and individuals in industries as diverse as land and project development, aerospace, chemicals, oil and gas, mining, timber, manufacturing, computers, agriculture and water service.
Roger began his legal career as a trial lawyer in San Jose, California, after graduating magna cum laude from the University of Santa Clara School of Law. As a partner in Matthews & Marzulla he represented developers, title and construction companies, shopping centers, apartment owners and lenders in litigation throughout California. In 1981 he moved to Denver to become President of Mountain States Legal Foundation, litigating environmental and natural resource cases across the West.
In 1983 Roger joined the Justice Department as Special Litigation Counsel. He was subsequently promoted to Deputy Assistant Attorney General and, in 1987, was confirmed by the Senate as Assistant Attorney General in charge of the Environment and Natural Resources Division. At the Justice Department, Roger helped create litigation strategies for government programs as diverse as Superfund, the Clean Air Act, off-shore oil leasing, environmental crimes, federal facility clean-up, wetlands, endangered species and hazardous waste enforcement, as well as Presidential Order EO 12,630 (Government Interference with Private Property Rights).
In 1989 Roger returned to private law practice, successively heading the environmental law practices of the Powell, Goldstein and Akin, Gump law firms.
Since 1997, as a partner in Marzulla Law, Roger has continued to represent corporate and business clients in a wide array of environmental and property issues in courts across the country, frequently in litigation against the United States. He also assists clients in attaining compliance with environmental, health and safety regulation, and in avoiding risks in transactions.
The Anti-Energy Litigation of the State Attorneys General
Marlo Lewis
Does Section 108 of the Clean Air Act (CAA) impose a “mandatory duty” on the...
The Benefits and Costs of Sound Economics: The "Clear Skies" Dilemma
Jeffrey Ladik
In early 2003, officials from the U.S. Environmental Protection Agency (EPA) embarked on a “listening...
Hot Topics: Judicial Activism
Michael B. Brennan, Michael S. Greve
When President George W. Bush announced his first nominations for the federal bench, he declared,...
Jeffrey Bossert Clark reviews Chemicals, Cancer, and Choices by Peter Van Doren
Jeffrey Bossert Clark
In his recent monograph, subtitled "Risk Reduction Through Markets," Cato Scholar Peter VanDoren hits his...
The Recent Controversy Over the Non Delegation Doctrine
Jeffrey Bossert Clark
On May 14, 1999, in American Trucking Association v. EPA2 the United States Court of...
Case Note: Harmon Industries, Inc. v. Browner
On September 16, 1999, the Eighth Circuit handed the Environmental Protection Agency ("EPA") another defeat...
Should Federal Wetlands Regulation Give Way to State and Private Initiatives?
Jonathan H. Adler
It is hard for many to believe that Maryland developer James J. Wilson could be...
Comment on American Trucking Associations, et al., v. EPA
Edward W. Warren
The D.C. Circuit's opinion in American Trucking Associations v. EPA (ATA)1 is both more and...
Administrative Common Law and the Original Meaning of Judicial Review Under the APA
John F. Duffy
In 1946 Congress enacted a "comprehensive statement of the right, mechanics, and scope of judicial...
Administrative Crimes: Testimony of Roger Marzulla
Roger J. Marzulla
[Testimony of Roger J. Marzulla Before the Judiciary Committee of the House of Representatives Subcommittee...