Horner has testified before the United States Senate Committees on Foreign Relations and Environment and Public Works, and works on a legal and policy level with numerous think tanks and policy organizations throughout the world. He has given numerous addresses to audiences in the European Parliament in Strasbourg and Brussels, and before policymakers in European capitals including London, Rome, Prague, Copenhagen, Madrid and Warsaw, on topics ranging from rail deregulation and unfunded pension liability to all manner of energy and environment issues. Horner serves on the international law practice group’s executive committee for an internationally respected assembly of lawyers, and has provided counsel and work product on other matters including intellectual property, WTO proceedings and treaty law and policy.
Greenpeace has repeatedly targeted Mr. Horner, by stealing his garbage on a weekly basis, issuing press releases announcing with whom he dines and including him in various other hysterical publications including most recently "A Field Guide to Climate Criminals" distributed at the UN climate meeting in Montreal in December 2005.
Mr. Horner has provided legal, policy and political commentary several hundred times each on both television and radio, in the United States, Europe, Canada, and Australia, including scores of visits each on the Fox News Channel, Court TV, MSNBC with repeat visits on The News Hour with Jim Lehrer, BBC, CNN, CNN International, ITN, CBC, Bloomberg and Reuters Television. Mr. Horner has also been a guest on The Daily Show with Jon Stewart. He has guest hosted television commentary programs and makes weekly appearances on and regularly guest hosts nationally and regionally syndicated radio shows in America.
He has been a frequent contributor in the Washington Times, National Review Online and TechCentralStation.com opinion pages, is a guest columnist for United Press International and OpinionEditorials.com, and has regularly contributed to the Brussels legislative news magazine EU Reporter .
Horner also regularly writes for Energy Tribune and Spain's Actualidad Economica.
He received his Juris Doctorate from Washington University in St. Louis where he received the Judge Samuel Breckenridge Award for Advocacy.