Former Acting Assistant Attorney General, United States Department of Justice; Partner, Winston & Strawn LLP
Jonathan “Jon” Brightbill is a trial and appellate lawyer in Winston’s Washington, D.C. office, and a partner in the firm’s Litigation and White Collar, Regulatory Defense, and Investigations Practices. He represents public and private companies, corporate officers, and other individuals across white collar, regulatory defense, and government and internal investigation matters and rulemaking challenges, as well as complex commercial disputes, citizen suits, and class actions. His commercial litigation experience encompasses business disputes, false advertising, consumer protection and fraud, FCA, and extensive class action defense work; antitrust and unfair competition matters; and intellectual property litigation, such as trademarks, patents, and trade secrets.
Jon served as the Nation’s lead environmental civil and criminal enforcement official and litigator, as Acting Assistant Attorney General for the Environment & Natural Resources Division (“ENRD”) of the U.S. Department of Justice (DOJ). Jon led ENRD’s 425 lawyers, overseeing 6,500 active matters and managing an annual budget of more than $150 million. Jon brings highly experienced executive leadership from among the most senior level of DOJ on white collar and regulatory enforcement, as well as on federal policymaking and rulemaking development and challenges. He speaks with authority on government decision-making processes, and the arguments and perspectives that move regulators and enforcers, best advising and positioning clients to deal with challenges.
Jon argued many of the government’s most significant cases during his time with the DOJ. This included the Navigable Waters Protection Rule and Clean Water Rule Repeal (10th Cir., district courts), the Affordable Clean Energy Rule and Clean Power Plan Repeal (D.C. Cir), defense of EPA actions on pesticide tolerances under FIFRA and the FDCA (9th Cir. en banc), among numerous others. Jon represented the United States in trial courts in both enforcement and defensive cases, including federal enforcement action against Jeffrey Lowe and the Tiger King Park, of Netflix fame, securing a first-of-its-kind injunction for violations of the Endangered Species Act and Animal Welfare Act. Jon directed the litigation and briefing of scores of additional federal cases nationwide, covering all of the major environmental and natural resources statutes, such as the Clean Air Act, the Clean Water Act, FIFRA (pesticides), FDCA (food safety), TSCA (toxics), CERCLA (land remediation), RCRA (waste), National Environmental Policy Act, Federal Land Policy and Management Act, and numerous other land- and resource-management statutes.
Jon has unmatched experience litigating legal and technical issues relating to climate change. He argued in the courts of appeals, including the D.C. Circuit, regarding the most significant climate change regulations by EPA, as well as the preemptive scope of the Clean Air Act. Jon also litigated climate change-related credit and trading schemes and international agreements in district court. During Jon’s time in leadership at ENRD, it successfully defeated one of the most wide-ranging lawsuits regarding climate change to date—obtaining a stay pending interlocutory appeal and dismissal just weeks before a scheduled three-month trial on federal government liability for climate change.
An accomplished trial lawyer, prior to working at DOJ, Jon was a partner in the Washington, D.C. office of another global law firm. He not only represents clients in court, but creatively counsels corporations on balancing business needs and realities with a broad range of litigation risks and compliance obligations. Jon is also an Adjunct Professor at Georgetown University Law Center. He served on the American Bar Association’s E-Discovery Working Group for Bankruptcy Practice, and was a frequent lecturer for District of Columbia Bar Association Continuing Legal Education Programs.
Jon served as an appellate clerk for the Honorable D. Brooks Smith, U.S. Court of Appeals for the Third Circuit, after graduating magna cum laude from the Georgetown University Law Center. He worked in state government as an Executive Policy Specialist for air, waste, land remediation, and radiation matters at the Pennsylvania Department of Environmental Protection.
President and Chief Policy Officer, CGCN
Throughout his career, Michael Catanzaro has served in several senior energy and environmental policy positions in the federal government, including the House of Representatives, U.S. Senate, the EPA, and the White House.
Before joining CGCN, Catanzaro served as Special Assistant to President Trump for Domestic Energy and Environmental Policy at the White House National Economic Council. In that role, he helped craft energy and environmental policy at multiple agencies and advised the president on the administration’s major policy decisions in that space. He previously served on the Senate Environment and Public Works Committee and on the Bush-Cheney re-election campaign as a top adviser on energy and environmental policy. Catanzaro was Associate Director for Policy in the White House Council on Environmental Quality and Associate Deputy Administrator of the EPA under former President George W. Bush. He also served as a senior adviser to then-Speaker John Boehner on energy and environmental policy.
Deputy Secretary of Energy
James P. Danly was sworn in as Deputy Secretary on June 9, 2025.
Before arriving at the Department, Deputy Secretary Danly was a partner and the Energy Regulatory Group leader at Skadden in Washington, D.C. This followed his service at the Federal Energy Regulatory Commission, first as the Commission’s general counsel then as the commissioner and chairman.
Deputy Secretary Danly was an officer in the United States Army. He served two tours in Iraq, receiving a Bronze Star and a Purple Heart.
A graduate of Yale University, Deputy Secretary Danly earned his J.D. from Vanderbilt University Law School. He clerked for Judge Danny J. Boggs of the Sixth Circuit.
Chairman, Council on Environmental Quality
Mary B. Neumayr is the current Chairman of the Council on Environmental Quality (CEQ). She was unanimously confirmed by the United States Senate on January 2, 2019, and sworn in as Chairman on January 10, 2019. Prior to her appointment, Ms. Neumayr had been serving as CEQ’s Chief of Staff since March 2017.
Before joining CEQ, Ms. Neumayr served in a variety of positions with the Committee on Energy and Commerce in the United States House of Representatives, including as Deputy Chief Counsel, Energy and Environment (2017); Senior Energy Counsel (2011-2017); and Counsel (2009-2010). Ms. Neumayr also served as Deputy General Counsel for Environment and Nuclear Programs at the Department of Energy (2006-2009) and as Counsel to the Assistant Attorney General for the Environment and Natural Resources Division at the Department of Justice (2003-2006).
Prior to her Government service, Ms. Neumayr was in private legal practice from 1989 through 2003 in New York and San Francisco. She received her B.A. from Thomas Aquinas College and J.D. from the University of California, Hastings College of the Law.
Partner, Jones Day
Justin Herdman, a former United States Attorney, is a trial lawyer who represents businesses and individuals involved in high-stakes government investigations, criminal litigation, and civil actions. Justin's practice is focused on obtaining favorable results in matters arising from alleged violations of state and federal laws, including fraud, the Foreign Corrupt Practices Act (FCPA), and the False Claims Act (FCA). He has successfully tried numerous cases in state and federal courts throughout his two decades in public service and private practice.
Prior to rejoining Jones Day in 2021, Justin served as the chief federal law enforcement officer for the Northern District of Ohio. Justin was nationally recognized for his effort in developing strategic responses to controlled substances, terrorism, and violent crime. While U.S. Attorney, Justin served as vice chair of the Attorney General's Advisory Committee (AGAC), where he provided national-level guidance on the management and operations of the Justice Department. Justin was also named co-chair of the Attorney General's Prescription Interdiction and Litigation Task Force and was chair of AGAC's Terrorism and National Security Subcommittee.
Justin also maintains an active pro bono practice. In 2022, his trial work with the Ohio Innocence Project led to the acquittal of a wrongfully convicted man who had spent 15 years in state prison.
Justin previously served as an Assistant U.S. Attorney prosecuting national security offenses, including terrorism, money laundering, and export control violations. He is a former assistant district attorney in New York City and currently serves as a judge advocate in the U.S. Air Force Reserve.
Judge, United States Court of Appeals, Sixth Circuit
Judge Readler earned his undergraduate and law degrees from the University of Michigan. After graduating, he served as a law clerk to Judge Alan Norris of the United States Court of Appeals for the Sixth Circuit. Judge Readler then began practicing law in the Columbus office of the international law firm Jones Day, eventually spending ten years as a partner in the firm’s Issues and Appeals Practice Group. While at Jones Day, Judge Readler appeared in state and federal trial and appellate courts around the country, most frequently the Supreme Court of Ohio and the Sixth Circuit. Judge Readler also successfully argued before the United States Supreme Court in McQuiggin v. Perkins on behalf of an inmate claiming actual innocence. His other pro bono representations include representing capital defendants before the Tenth Circuit and the Supreme Court of Ohio, as well as representing defendants sentenced to life in prison before the Sixth Circuit. While at Jones Day, Judge Readler traveled to Nairobi with Lawyers Without Borders to train Kenyan lawyers in prosecuting domestic violence cases, and he was also a recipient of the American Marshall Memorial Fellowship awarded by the German Marshall Fund of the United States. Following his career in private practice, Judge Readler served as Acting Assistant Attorney General for the Civil Division of the United States Department of Justice from 2017 to 2019. In that role, Judge Readler led and supervised over 1,000 lawyers in the Department’s largest litigating division, briefing and arguing several cases on behalf of the United States in federal courts across the country, including high-profile cases significant to the Administration and the Department. In March 2019, Judge Readler was confirmed to serve as a Circuit Judge on the Sixth Circuit. He resides in Columbus.
Partner, Jones Day
Justin Herdman, a former United States Attorney, is a trial lawyer who represents businesses and individuals involved in high-stakes government investigations, criminal litigation, and civil actions. Justin's practice is focused on obtaining favorable results in matters arising from alleged violations of state and federal laws, including fraud, the Foreign Corrupt Practices Act (FCPA), and the False Claims Act (FCA). He has successfully tried numerous cases in state and federal courts throughout his two decades in public service and private practice.
Prior to rejoining Jones Day in 2021, Justin served as the chief federal law enforcement officer for the Northern District of Ohio. Justin was nationally recognized for his effort in developing strategic responses to controlled substances, terrorism, and violent crime. While U.S. Attorney, Justin served as vice chair of the Attorney General's Advisory Committee (AGAC), where he provided national-level guidance on the management and operations of the Justice Department. Justin was also named co-chair of the Attorney General's Prescription Interdiction and Litigation Task Force and was chair of AGAC's Terrorism and National Security Subcommittee.
Justin also maintains an active pro bono practice. In 2022, his trial work with the Ohio Innocence Project led to the acquittal of a wrongfully convicted man who had spent 15 years in state prison.
Justin previously served as an Assistant U.S. Attorney prosecuting national security offenses, including terrorism, money laundering, and export control violations. He is a former assistant district attorney in New York City and currently serves as a judge advocate in the U.S. Air Force Reserve.
Judge, United States Court of Appeals, Sixth Circuit
Judge Readler earned his undergraduate and law degrees from the University of Michigan. After graduating, he served as a law clerk to Judge Alan Norris of the United States Court of Appeals for the Sixth Circuit. Judge Readler then began practicing law in the Columbus office of the international law firm Jones Day, eventually spending ten years as a partner in the firm’s Issues and Appeals Practice Group. While at Jones Day, Judge Readler appeared in state and federal trial and appellate courts around the country, most frequently the Supreme Court of Ohio and the Sixth Circuit. Judge Readler also successfully argued before the United States Supreme Court in McQuiggin v. Perkins on behalf of an inmate claiming actual innocence. His other pro bono representations include representing capital defendants before the Tenth Circuit and the Supreme Court of Ohio, as well as representing defendants sentenced to life in prison before the Sixth Circuit. While at Jones Day, Judge Readler traveled to Nairobi with Lawyers Without Borders to train Kenyan lawyers in prosecuting domestic violence cases, and he was also a recipient of the American Marshall Memorial Fellowship awarded by the German Marshall Fund of the United States. Following his career in private practice, Judge Readler served as Acting Assistant Attorney General for the Civil Division of the United States Department of Justice from 2017 to 2019. In that role, Judge Readler led and supervised over 1,000 lawyers in the Department’s largest litigating division, briefing and arguing several cases on behalf of the United States in federal courts across the country, including high-profile cases significant to the Administration and the Department. In March 2019, Judge Readler was confirmed to serve as a Circuit Judge on the Sixth Circuit. He resides in Columbus.
Judge, United States Court of Appeals, Sixth Circuit
Judge Readler earned his undergraduate and law degrees from the University of Michigan. After graduating, he served as a law clerk to Judge Alan Norris of the United States Court of Appeals for the Sixth Circuit. Judge Readler then began practicing law in the Columbus office of the international law firm Jones Day, eventually spending ten years as a partner in the firm’s Issues and Appeals Practice Group. While at Jones Day, Judge Readler appeared in state and federal trial and appellate courts around the country, most frequently the Supreme Court of Ohio and the Sixth Circuit. Judge Readler also successfully argued before the United States Supreme Court in McQuiggin v. Perkins on behalf of an inmate claiming actual innocence. His other pro bono representations include representing capital defendants before the Tenth Circuit and the Supreme Court of Ohio, as well as representing defendants sentenced to life in prison before the Sixth Circuit. While at Jones Day, Judge Readler traveled to Nairobi with Lawyers Without Borders to train Kenyan lawyers in prosecuting domestic violence cases, and he was also a recipient of the American Marshall Memorial Fellowship awarded by the German Marshall Fund of the United States. Following his career in private practice, Judge Readler served as Acting Assistant Attorney General for the Civil Division of the United States Department of Justice from 2017 to 2019. In that role, Judge Readler led and supervised over 1,000 lawyers in the Department’s largest litigating division, briefing and arguing several cases on behalf of the United States in federal courts across the country, including high-profile cases significant to the Administration and the Department. In March 2019, Judge Readler was confirmed to serve as a Circuit Judge on the Sixth Circuit. He resides in Columbus.
Fellow, Georgetown University Center for the Constitution
Yonatan Green is a Fellow at the Georgetown University Center for the Constitution. He is co-founder and former Executive Director of the Jerusalem-based Israel Law & Liberty Forum, a project of the Tikvah Fund. He holds a degree in Law and Communications from the Hebrew University of Jerusalem and is a licensed attorney in Israel and New York.
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