Legal Representation Of The Highest Quality
Photo of William P. Horn

William P. Horn

  • Of Counsel


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, Washington, District of Columbia
    • J.D. - 1983
  • American University, Washington, District of Columbia
    • B.A. - 1972
    • Honors: With Honors

Admitted to Practice

  • District of Columbia, 1983
  • U.S. Court of Appeals District of Columbia Circuit
  • U.S. Court of Appeals 9th Circuit
  • U.S. Court of Appeals 10th Circuit
  • U.S. Supreme Court
  • U.S. District Court for the District of Columbia
  • U.S. Court of Federal Claims

Practice Areas

Professional Associations

  • District of Columbia Bar, Member

Past Positions

  • United States Department of the Interior, Assistant Secretary, 1985 to 1988
  • U.S. Department of the Interior Deputy Undersecretary 1981-84
  • U.S. Commissioner U.S.-Canada Great Lakes Fishery Commission 1982-88

Published Works

  • Private Claims and Public Resources, Natural Resources and Environment American Bar Association, 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
  • On The Bow: Love, Fear and Fascination in Pursuit of Bonefish, Tarpon and Permit, Stackpole Books, 2021
  • Co-Author Appalachian Grouse Dog, Catamount Press, 2021
  • Contributor A Passion for Grouse, Wild River Press, 2013

Pro-Bono Activities

  • President to Falling Spring Greenway, Inc.
  • 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
  • Vice Chairman, Bonefish Tarpon Trust
  • President, Friends of the Teton River
  • Trout Unlimited, Board of Directors


  • International Academy of Trial Lawyers Advocacy Award
  • Outstanding Service Award, United States Department of the Interior
  • Department of the Interior, Outstanding Service Award


  • Bismuth Cartridge Co., Dallas, Texas
  • Wildlife Legislative Fund of America, Columbus, Ohio