Alexander Arensberg advises clients on complex litigation and regulatory compliance issues before federal and state agencies. His practice focuses on public lands and natural resource law, renewable energy development, and environmental compliance. He also has extensive experience litigating challenges to administrative decision-making, drafting appellate briefs in both federal and state courts, advising on large-scale infrastructure development projects, and conducting internal investigations and compliance reviews in response to government enforcement actions.
As a member of the firm’s Environmental, Safety & Health Practice Group, Alexander advises clients on permitting and regulatory compliance issues arising under a broad array of federal and state environmental laws, including the National Environmental Policy Act (NEPA), Clean Water Act, Federal Land Policy and Management Act, Mining Law of 1872, Mineral Leasing Acts, Oil Pollution Act, CERCLA, Endangered Species Act and National Historic Preservation Act. This work involves close coordination with federal land managers and other permitting agencies, including the Bureau of Land Management (BLM), US Forest Service (USFS), US Fish and Wildlife Service (USFWS), US Army Corps of Engineers (USACE), Environmental Protection Agency (EPA) and various state agencies.
Alexander has successfully litigated complex cases in state and federal court, including appeals before the Eighth, Ninth, Tenth and D.C. Circuit courts of appeals. His experience includes successfully challenging agency rulemaking and permitting decisions under the federal Administrative Procedure Act and counterpart state laws. He also helps clients participate in the administrative rulemaking process and frequently drafts public comments on their behalf in response to proposed regulations and other agency actions.
Alexander also has significant experience assisting clients to respond to government investigations and enforcement actions, including matters involving investigations by the US Securities and Exchange Commission (SEC), Department of Justice (DOJ) and State Attorneys General.
Alexander graduated from the University of California Berkeley School of Law, where he was the senior executive editor of the Ecology Law Quarterly and received a Certificate of Specialization in Environmental Law. In 2020, 2021, 2022 and 2023, Alexander was named a Rising Star by Colorado Super Lawyers.