United States Attorney, Eastern District of California
Mr. Grant was appointed by Attorney General Pam Bondi to serve as the United States Attorney for the Eastern District of California beginning on August 11, 2025. Pursuant to 28 U.S.C. § 546(d), he was further appointed by the district court effective December 9, 2025.
Mr. Grant is a veteran of the Department of Justice, having served twice in Washington, D.C.: from 1991 to 1993 as an Attorney-Adviser in the Office of Legal Counsel, and from 2017 to 2021 as a Deputy Assistant Attorney General in the Environment and Natural Resources Division (ENRD). During his tenure at ENRD, he supervised more than a hundred Department litigators advancing the interests of the United States and its agencies in both enforcement and defensive matters, both civil and criminal.
In addition to his service in the Department, Mr. Grant has decades of experience in private practice in Washington, D.C. and Sacramento. That experience includes arguments in the U.S. Supreme Court, the California Supreme Court, and numerous other federal and state courts.
Mr. Grant served as a law clerk to Chief Justice Warren E. Burger (retired) and Associate Justice Clarence Thomas during the Supreme Court’s October 1994 Term. Earlier he served as a law clerk to Judge Edith H. Jones of the U.S. Court of Appeals for the Fifth Circuit in Houston, Texas.
Mr. Grant grew up in Modesto, California and raised his family in Sacramento County. He attended the University of California, Berkeley, from which he earned a bachelor’s degree in economics (1986) and a law degree (1990).
Partner, Hunton Andrews Kurth
Mr. Leopold is a Partner with the law firm of Hunton Andrews Kurth in Washington, DC. He is the former Senate-confirmed general counsel of the U.S. EPA from 2018-2020, and he previously was a litigator at the U.S. Department of Justice, Environment and Natural Resources Division form 2007-2013. As EPA General Counsel, he counseled on the development and defense of EPA’s most significant rulemakings, including the Affordable Clean Energy Rule, the Navigable Waters Protection Rule, and the Safe Affordable Fuel‐Efficient (SAFE) Vehicles Rule, as well as several pesticide actions. He was personally involved in defending EPA in litigation, including the County of Maui v. Hawaii Wildlife Fund in the U.S. Supreme Court. Mr. Leopold’s prior government service also includes working in Florida as general counsel of the Florida Department of Environmental Protection. He now represents clients in regulatory advocacy before federal agencies, litigates federal environmental actions, and defends clients with EPA enforcement issues.
Emmett Visiting Assistant Clinical Professor of Law in Environmental Law, Harvard Law School
Andrew Mergen is a Visiting Assistant Clinical Professor of Law and Faculty Director of the Emmett Environmental Law & Policy Clinic. Prior to joining the Harvard Law School faculty, Andrew Mergen served in the Appellate Section of the Environment & Natural Resources Division (ENRD) at the United States Department of Justice. Professor Mergen began his career at the Justice Department in the Honors Program and concluded his career as Chief of ENRD’s Appellate Section. He has presented oral arguments in all 13 federal courts of appeals, including two en banc courts, and before several state intermediate and supreme courts. He has also worked on over a dozen merits cases in the Supreme Court of the United States. In addition, in 2009, Professor Mergen assisted the Office of White House Counsel on the confirmation of the Honorable Sonia Sotomayor as Associate Justice of the Supreme Court. During his career at the Justice Department, Professor Mergen received the Attorney General’s Award for Distinguished Service three times. He also received ENRD’s Muskee-Chafee Award, honoring his work’s significant contribution to protecting the environment.
Before entering clinical teaching, Professor Mergen taught at several law schools including, Harvard Law School (Advanced Environmental Law), the University of Michigan Law School (Natural Resources Law) and the William S. Richardson School of Law, University of Hawaii-Manoa (Administrative Law). Professor Mergen has written about federal water rights in “A Misplaced Sensitivity: The Draft Opinions in Wyoming v. United States” (68 Colo. L. Rev. 683 (1997), with Sylvia F. Liu); energy development on public lands in “Surface Tension: The Problem of Federal Private Split Estates” (33 Land & Water L. Rev. 419 (1998)); climate change and the Endangered Species Act in “The Role of Climate Change in ESA Listing Decisions” (53 Rocky Mt. Min. L. Fdn. 67 (2016), with Murray Feldman) and the accommodation of Native American sacred sites on federal land in “Finding the Path Forward for Indigenous Sacred and Cultural Spaces on Federal Public Land,” 68 Nat. Resources & Energy L. Inst. 32-1 (2022). Professor Mergen is a graduate of the University of Wisconsin—Madison and the George Washington University Law School.
Senior Vice President of Programs, Earthjustice
Sam Sankar is Earthjustice’s Senior Vice President for Programs. Sam leads our Program Leadership Team, which develops Earthjustice’s strategy for carrying out our mission through litigation, lobbying and regulatory advocacy, and communications.
Sam has been working on environmental issues throughout his career, which has included service as a line attorney at the Justice Department’s Environment and Natural Resources Division, as a senior executive at General Electric, and as deputy chief counsel of a presidential commission formed to investigate the 2010 Deepwater Horizon oil spill. He has also worked as a boat captain, machinist, and senior advisor to The Nature Conservancy.
Sam received his B.S. in civil engineering from Cornell University, an M.S. in environmental engineering from Stanford University, and his law degree from the University of California, Berkeley. After law school, he clerked for Judge William Fletcher of the Ninth Circuit, Judge Louis Pollak of the Eastern District of Pennsylvania, and Justice Sandra Day O’Connor of the U.S. Supreme Court.
Sam lives in Washington, D.C., with his wife and two children.
Partner, Baker Botts LLP
Drawing from two decades of experience in senior government, in-house corporate, and private law firm roles, Jeff Wood helps clients with federal enforcement, compliance, litigation, permitting, and policy challenges primarily in the energy and environmental fields.
Prior to joining Baker Botts, Mr. Wood served for almost two years as the Acting Assistant Attorney General (AAG) for the Justice Department's Environment and Natural Resources Division (ENRD). In that capacity, Mr. Wood led ENRD and its more than 600 attorneys and staff representing EPA, Departments of the Interior, Energy, and Defense, and other agencies in civil and criminal enforcement and defensive environmental, energy, and natural resources litigation.
As the top official in ENRD, Mr. Wood managed a complex organization with an annual budget exceeding $200 million and a docket of more than 6,000 cases and matters. E&E News noted that “Wood maintains a strong relationship with ENRD's career staff” (Greenwire, Oct. 31, 2018). He previously served on the staff of the United States Senate Committee on Environment and Public Works.
At the Justice Department, Mr. Wood oversaw the Division's civil and criminal enforcement programs and was responsible for developing legal strategies and approving briefs in key cases including filings before the Supreme Court and Courts of Appeals in coordination with the Office of Solicitor General. In this role, Mr. Wood held the highest level security clearance and worked closely with top leadership at DOJ, EPA, the Interior Department, USDA, the Energy Department, Transportation Department, FERC, NRC and across the Executive Branch, including the White House.
With many years of both private law firm and in-house legal experience, Mr. Wood has handled complex environmental enforcement, regulatory, policy, and litigation matters for electric utilities, energy companies, maritime companies, mining companies, real estate developers, financial institutions, industrial companies and manufacturers, business coalitions, associations, small businesses, and individual property owners. Drawing from his experiences in-house, Mr. Wood brings a common-sense, cost-effective, client-focused approach to his work every day.
With a strong national reputation, Mr. Wood is a frequent speaker on environmental law and policy matters, with recent speeches and presentations at the Environmental Law Institute, Harvard Law School, Vanderbilt Law School, American University Law School, American Bar Association Environmental Law Conferences, the Texas Environmental SuperConference, Air Force Judge Advocate General School's Advanced Environmental Law Course, Baker Institute's Center for Energy Studies (Rice University), and many other venues. He frequently appears in national news to share insights on significant environmental law and policy issues, including recent quotes in the New York Times, Washington Post, Wall Street Journal, Bloomberg, Law360, and E&E News, among others.
United States Attorney, Eastern District of California
Mr. Grant was appointed by Attorney General Pam Bondi to serve as the United States Attorney for the Eastern District of California beginning on August 11, 2025. Pursuant to 28 U.S.C. § 546(d), he was further appointed by the district court effective December 9, 2025.
Mr. Grant is a veteran of the Department of Justice, having served twice in Washington, D.C.: from 1991 to 1993 as an Attorney-Adviser in the Office of Legal Counsel, and from 2017 to 2021 as a Deputy Assistant Attorney General in the Environment and Natural Resources Division (ENRD). During his tenure at ENRD, he supervised more than a hundred Department litigators advancing the interests of the United States and its agencies in both enforcement and defensive matters, both civil and criminal.
In addition to his service in the Department, Mr. Grant has decades of experience in private practice in Washington, D.C. and Sacramento. That experience includes arguments in the U.S. Supreme Court, the California Supreme Court, and numerous other federal and state courts.
Mr. Grant served as a law clerk to Chief Justice Warren E. Burger (retired) and Associate Justice Clarence Thomas during the Supreme Court’s October 1994 Term. Earlier he served as a law clerk to Judge Edith H. Jones of the U.S. Court of Appeals for the Fifth Circuit in Houston, Texas.
Mr. Grant grew up in Modesto, California and raised his family in Sacramento County. He attended the University of California, Berkeley, from which he earned a bachelor’s degree in economics (1986) and a law degree (1990).
Partner, Hunton Andrews Kurth
Mr. Leopold is a Partner with the law firm of Hunton Andrews Kurth in Washington, DC. He is the former Senate-confirmed general counsel of the U.S. EPA from 2018-2020, and he previously was a litigator at the U.S. Department of Justice, Environment and Natural Resources Division form 2007-2013. As EPA General Counsel, he counseled on the development and defense of EPA’s most significant rulemakings, including the Affordable Clean Energy Rule, the Navigable Waters Protection Rule, and the Safe Affordable Fuel‐Efficient (SAFE) Vehicles Rule, as well as several pesticide actions. He was personally involved in defending EPA in litigation, including the County of Maui v. Hawaii Wildlife Fund in the U.S. Supreme Court. Mr. Leopold’s prior government service also includes working in Florida as general counsel of the Florida Department of Environmental Protection. He now represents clients in regulatory advocacy before federal agencies, litigates federal environmental actions, and defends clients with EPA enforcement issues.
Emmett Visiting Assistant Clinical Professor of Law in Environmental Law, Harvard Law School
Andrew Mergen is a Visiting Assistant Clinical Professor of Law and Faculty Director of the Emmett Environmental Law & Policy Clinic. Prior to joining the Harvard Law School faculty, Andrew Mergen served in the Appellate Section of the Environment & Natural Resources Division (ENRD) at the United States Department of Justice. Professor Mergen began his career at the Justice Department in the Honors Program and concluded his career as Chief of ENRD’s Appellate Section. He has presented oral arguments in all 13 federal courts of appeals, including two en banc courts, and before several state intermediate and supreme courts. He has also worked on over a dozen merits cases in the Supreme Court of the United States. In addition, in 2009, Professor Mergen assisted the Office of White House Counsel on the confirmation of the Honorable Sonia Sotomayor as Associate Justice of the Supreme Court. During his career at the Justice Department, Professor Mergen received the Attorney General’s Award for Distinguished Service three times. He also received ENRD’s Muskee-Chafee Award, honoring his work’s significant contribution to protecting the environment.
Before entering clinical teaching, Professor Mergen taught at several law schools including, Harvard Law School (Advanced Environmental Law), the University of Michigan Law School (Natural Resources Law) and the William S. Richardson School of Law, University of Hawaii-Manoa (Administrative Law). Professor Mergen has written about federal water rights in “A Misplaced Sensitivity: The Draft Opinions in Wyoming v. United States” (68 Colo. L. Rev. 683 (1997), with Sylvia F. Liu); energy development on public lands in “Surface Tension: The Problem of Federal Private Split Estates” (33 Land & Water L. Rev. 419 (1998)); climate change and the Endangered Species Act in “The Role of Climate Change in ESA Listing Decisions” (53 Rocky Mt. Min. L. Fdn. 67 (2016), with Murray Feldman) and the accommodation of Native American sacred sites on federal land in “Finding the Path Forward for Indigenous Sacred and Cultural Spaces on Federal Public Land,” 68 Nat. Resources & Energy L. Inst. 32-1 (2022). Professor Mergen is a graduate of the University of Wisconsin—Madison and the George Washington University Law School.
Senior Vice President of Programs, Earthjustice
Sam Sankar is Earthjustice’s Senior Vice President for Programs. Sam leads our Program Leadership Team, which develops Earthjustice’s strategy for carrying out our mission through litigation, lobbying and regulatory advocacy, and communications.
Sam has been working on environmental issues throughout his career, which has included service as a line attorney at the Justice Department’s Environment and Natural Resources Division, as a senior executive at General Electric, and as deputy chief counsel of a presidential commission formed to investigate the 2010 Deepwater Horizon oil spill. He has also worked as a boat captain, machinist, and senior advisor to The Nature Conservancy.
Sam received his B.S. in civil engineering from Cornell University, an M.S. in environmental engineering from Stanford University, and his law degree from the University of California, Berkeley. After law school, he clerked for Judge William Fletcher of the Ninth Circuit, Judge Louis Pollak of the Eastern District of Pennsylvania, and Justice Sandra Day O’Connor of the U.S. Supreme Court.
Sam lives in Washington, D.C., with his wife and two children.
Partner, Baker Botts LLP
Drawing from two decades of experience in senior government, in-house corporate, and private law firm roles, Jeff Wood helps clients with federal enforcement, compliance, litigation, permitting, and policy challenges primarily in the energy and environmental fields.
Prior to joining Baker Botts, Mr. Wood served for almost two years as the Acting Assistant Attorney General (AAG) for the Justice Department's Environment and Natural Resources Division (ENRD). In that capacity, Mr. Wood led ENRD and its more than 600 attorneys and staff representing EPA, Departments of the Interior, Energy, and Defense, and other agencies in civil and criminal enforcement and defensive environmental, energy, and natural resources litigation.
As the top official in ENRD, Mr. Wood managed a complex organization with an annual budget exceeding $200 million and a docket of more than 6,000 cases and matters. E&E News noted that “Wood maintains a strong relationship with ENRD's career staff” (Greenwire, Oct. 31, 2018). He previously served on the staff of the United States Senate Committee on Environment and Public Works.
At the Justice Department, Mr. Wood oversaw the Division's civil and criminal enforcement programs and was responsible for developing legal strategies and approving briefs in key cases including filings before the Supreme Court and Courts of Appeals in coordination with the Office of Solicitor General. In this role, Mr. Wood held the highest level security clearance and worked closely with top leadership at DOJ, EPA, the Interior Department, USDA, the Energy Department, Transportation Department, FERC, NRC and across the Executive Branch, including the White House.
With many years of both private law firm and in-house legal experience, Mr. Wood has handled complex environmental enforcement, regulatory, policy, and litigation matters for electric utilities, energy companies, maritime companies, mining companies, real estate developers, financial institutions, industrial companies and manufacturers, business coalitions, associations, small businesses, and individual property owners. Drawing from his experiences in-house, Mr. Wood brings a common-sense, cost-effective, client-focused approach to his work every day.
With a strong national reputation, Mr. Wood is a frequent speaker on environmental law and policy matters, with recent speeches and presentations at the Environmental Law Institute, Harvard Law School, Vanderbilt Law School, American University Law School, American Bar Association Environmental Law Conferences, the Texas Environmental SuperConference, Air Force Judge Advocate General School's Advanced Environmental Law Course, Baker Institute's Center for Energy Studies (Rice University), and many other venues. He frequently appears in national news to share insights on significant environmental law and policy issues, including recent quotes in the New York Times, Washington Post, Wall Street Journal, Bloomberg, Law360, and E&E News, among others.
Gordon Stewart Wood is an American historian and professor at Brown University. He is a recipient of the 1993 Pulitzer Prize for History for The Radicalism of the American Revolution (1992). His book The Creation of the American Republic, 1776–1787 (1969) won the 1970 Bancroft Prize. In 2010, he was awarded the National Humanities Medal by President Barack Obama.
Professor Emeritus, Uiversity of Connecticut
A native of Bridgeport, Connecticut, Robert A. Gross received the B.A. in American civilization from the University of Pennsylvania in 1966 and the M.A. (1968) and Ph.D. (1976) in history from Columbia University. He taught at Amherst College (1976-88), the University of Sussex (1981-83) and the College of William and Mary (1988-2003) before coming to UConn. He is the recipient of various national awards, including fellowships from the Guggenheim, Howard, and Rockefeller Foundations, the National Endowment for the Humanities, and the American Antiquarian Society.
Prof. Gross specializes in the social and cultural history of the U.S., from the colonial era through the nineteenth century. His first book on the American Revolution, The Minutemen and Their World (1976), won the Bancroft Prize in American History; it was re-issued in a 25th anniversary edition in 2001 and will be published by Picador in a new, revised edition in 2022 to commemorate the 250th anniversary of the American Revolution. He has continued studies of the Revolutionary era in such works as In Debt to Shays: The Bicentennial of an Agrarian Rebellion (1993). For two decades he has been deeply involved in the interdisciplinary field known as the history of the book, serving on the editorial board for the multi-volume History of the Book in America published by the University of North Carolina Press and co-editing with Mary Kelley the second volume of the series, An Extensive Republic: Print, Culture, and Society in the New Nation, 1790-1840 (2010). His other recent work examines New England writers — notably, Ralph Waldo Emerson, Henry David Thoreau, and Emily Dickinson — in historical context. From that project has come The Transcendentalists and Their World, which Farrar, Straus, & Giroux published in November 2021.
Senior Counsel, Director of Center for Academic Freedom, Alliance Defending Freedom
Tyson Langhofer serves as senior counsel and director of the Center for Academic Freedom with Alliance Defending Freedom.
Langhofer represents students and faculty at public high schools and colleges in defending their First Amendment rights. For example, in Denton v. Hecht, he successfully defended a Florida State University student after he was removed as Student Senate President simply for sharing his Catholic views in a private group chat. In Cross v. Loudoun County Public Schools, he successfully defended an elementary school gym teacher after the school suspended him for peacefully sharing his views on a proposed policy at a public school board meeting.
Langhofer has extensive experience in civil litigation and constitutional law. Before joining ADF, Langhofer was a partner with Stinson LLP, where he worked as a commercial litigation attorney from 2000 until he joined ADF in 2015.
Langhofer is Peer Review Rated AV® Preeminent in Martindale-Hubbell. He is a sought-after speaker on legal and cultural issues. He regularly comments on free speech issues in television, radio, and print media. He has appeared as a guest and written pieces for numerous major media outlets, including The Washington Post, The Washington Times, USA Today, Townhall, The Federalist, and The Daily Wire.
Langhofer earned his Juris Doctor from Regent University School of Law in 1999, graduating cum laude. Langhofer is admitted to practice in multiple states, the Supreme Court, and numerous federal district and appellate courts.
Vice President for Legal Strategy, Stand Together
Casey Mattox is Vice President for Legal Strategy at Stand Together and Senior Advisor at
Americans for Prosperity. In these roles he advocates for and creates strategies and
partnerships to ensure a constitutionally limited government that protects the civil liberties of all
Americans. Prior to joining Stand Together and AFP Casey’s legal career focused on defending
the First Amendment rights of students, faculty, healthcare workers and religious organizations.
Casey has a J.D. from Boston College School of Law and an undergraduate degree from the
University of Virginia. You can find him on Twitter at @CaseyMattox_ and on LinkedIn at
@Casey-Mattox-ST.
Senior Counsel, Director of Center for Academic Freedom, Alliance Defending Freedom
Tyson Langhofer serves as senior counsel and director of the Center for Academic Freedom with Alliance Defending Freedom.
Langhofer represents students and faculty at public high schools and colleges in defending their First Amendment rights. For example, in Denton v. Hecht, he successfully defended a Florida State University student after he was removed as Student Senate President simply for sharing his Catholic views in a private group chat. In Cross v. Loudoun County Public Schools, he successfully defended an elementary school gym teacher after the school suspended him for peacefully sharing his views on a proposed policy at a public school board meeting.
Langhofer has extensive experience in civil litigation and constitutional law. Before joining ADF, Langhofer was a partner with Stinson LLP, where he worked as a commercial litigation attorney from 2000 until he joined ADF in 2015.
Langhofer is Peer Review Rated AV® Preeminent in Martindale-Hubbell. He is a sought-after speaker on legal and cultural issues. He regularly comments on free speech issues in television, radio, and print media. He has appeared as a guest and written pieces for numerous major media outlets, including The Washington Post, The Washington Times, USA Today, Townhall, The Federalist, and The Daily Wire.
Langhofer earned his Juris Doctor from Regent University School of Law in 1999, graduating cum laude. Langhofer is admitted to practice in multiple states, the Supreme Court, and numerous federal district and appellate courts.
Vice President for Legal Strategy, Stand Together
Casey Mattox is Vice President for Legal Strategy at Stand Together and Senior Advisor at
Americans for Prosperity. In these roles he advocates for and creates strategies and
partnerships to ensure a constitutionally limited government that protects the civil liberties of all
Americans. Prior to joining Stand Together and AFP Casey’s legal career focused on defending
the First Amendment rights of students, faculty, healthcare workers and religious organizations.
Casey has a J.D. from Boston College School of Law and an undergraduate degree from the
University of Virginia. You can find him on Twitter at @CaseyMattox_ and on LinkedIn at
@Casey-Mattox-ST.
An Environmental Law Revolution: Will DOGE and the Second Trump Administration Achieve Lasting Positive Change?
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An Environmental Law Revolution: Will DOGE and the Second Trump Administration Achieve Lasting Positive Change?
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Theories of Presidential Power Series
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