Mr. Lorenzen is a partner in Dorsey & Whitney’s Regulatory Affairs Group. His practice focuses on environmental law and the federal rulemaking process. He represents clients in environmental compliance counseling, due diligence and other transactional work, and in trial and appellate litigation, administrative actions, enforcement proceedings and complex negotiations relating to environmental review, major facility permitting, air and water quality, hazardous and solid waste and environmental cleanup. From 2004 until joining Dorsey in 2013, Mr. Lorenzen was an Assistant Chief in the U.S. Department of Justice���s Environment and Natural Resources Division (ENRD). During that time, he supervised the federal government’s legal defense of all Environmental Protection Agency rules, regulations and other final actions judicially reviewable under the various federal pollution control statutes.
Over his 16-year career at the Justice Department, Mr. Lorenzen managed or personally litigated dozens of seminal environmental cases under the Clean Air Act, Clean Water Act, Safe Drinking Water Act, Federal Food, Drug and Cosmetic Act, and other federal pollution control statutes. Notable recent cases for which he was responsible include Massachusetts v. EPA and Coalition for Responsible Regulation v. EPA (in which the U.S. Supreme Court upheld the EPA’s authority to regulate greenhouse gas emissions under the Clean Air Act and the D.C. Circuit subsequently upheld its suite of greenhouse gas regulations), and Entergy Corp. v. Riverkeeper (in which the U.S. Supreme Court affirmed the EPA’s authority to weigh costs against benefits in determining how to regulate cooling water intake structures under the Clean Water Act). Mr. Lorenzen has worked closely over the years with the White House, EPA and other federal agencies to develop many of the rules that he and his team later defended. He is a recipient of numerous Department of Justice awards, including the prestigious John Marshall Award for Providing Legal Advice, awarded by the Attorney General in 2010 for his work with the White House, EPA and the Department of Transportation in developing the Light-duty Motor Vehicle Greenhouse Gas Rule.
For 12 years before joining the Department of Justice in 1997, Mr. Lorenzen was in private practice, where he developed expertise in environmental compliance counseling and due diligence, trial court and appellate litigation and corporate transactional practice.