William P. Horn

Mr. Horn specializes in natural resources law. He has extensive expertise in land acquisition and appraisal; wildlife law, including the Endangered Species Act and the Migratory Bird Treaty Act; national park concessions; Forest Service matters; recreation permits; and other public land and related regulatory matters. Mr. Horn’s experience in complex interstate land transactions includes the largest interstate land exchange ever consummated (the Arizona (Indian School)-Florida (Everglades) Exchange).

Mr. Horn has established an active and successful litigation as well as legislative practice. He frequently represents clients in the U.S. District Courts and the U.S. Courts of Appeal on matters including the Natural Environmental Policy Act, Endangered Species Act, National Park Organic Act and other public land, water, and wildlife statutes. In the legislative area, he works primarily with the Senate Committee on Energy and Natural Resources, the Senate Committee on Appropriations and the House Committee on Natural Resources. Mr. Horn has secured enactment of numerous statutory provisions as well as key reports and conference directives. A recognized expert in the field of natural resources law, he is a frequent speaker at national seminars and conferences.


American University, Washington College of Law (J.D., 1983)
American University (B.A., with honors, 1972)

Admitted to Practice

District of Columbia
U.S. District Court for the District of Columbia
U.S. Court of Appeals for the District of Columbia
U.S. Court of Appeals for the Ninth Circuit
U.S. Court of Appeals for the Tenth Circuit
U.S. Court of Federal Claims
U.S. Supreme Court

Awards and Honors

Department of the Interior, Outstanding Service Award
Secretary’s Award for Excellence [Dept. of the Interior]
International Academy of Trial Lawyers Advocacy Award

Other Professional Experience

Assistant Secretary of the Interior for Fish, Wildlife, and Parks
Deputy Under Secretary of the Interior
Chairman, Great Lakes Fishery Commission
Representative Matters and Selected Clients
U.S. Sportsmen’s Alliance
International Snowmobile Manufacturers Association
Specialty Vehicle Institute of America
Florida Power and Light
Miami Seaquarium
State of Alaska

Professional and Community Activities

National Academy of Sciences, Board on Environment Studies and Toxicology
National Academy of Sciences, Committee on the Independent Scientific Review of Everglades Restoration Progress
Chairman, National Wildlife Refuge Centennial Commission
President, Falling Spring Greenway, Inc.
Vice Chairman, Bonefish Tarpon Trust
President, Friends of the Teton River
Trout Unlimited, Board of Directors


American Bar Association’s Natural Resources and Environmental Journal “Private Claims and Public Resources”, Vol. 4, Spring 1990
The Legislative Labyrinth: A Map for Not-For-Profits “Introduction to the Legislative Process”; John Wiley & Sons, 2001
Seasons on the Flats: An Angler’s Year in the Florida Keys, Stackpole Books, August, 2012
Keys Weekly Newspaper, Columnist, 2013-2014