Mr. Shaheen is experienced in complex, multi-party litigation, both civil and criminal. For the past twenty-five years, his practice has emphasized natural resources litigation where he has represented oil and gas and coal companies in cases where the damages alleged exceeded hundreds of millions of dollars and forfeiture of a major operating coal mine. He has litigated and tried important oil and gas cases in the Rocky Mountain Region. He was lead trial counsel for 100 named oil company defendants and a defendant class of 3,000 royalty owners involving ownership of the coalbed methane underlying the Southern Ute Indian Reservation. The United States Supreme Court affirmed judgment in favor of the defendants and the class in 1999. He has also litigated and tried numerous other types of natural resources cases including those seeking damages for breach of contract, underpaid royalties, operational issues and environmental contamination.

Recently, Mr. Shaheen obtained the first defense verdict in a case brought under Rogers v. Westerman Farm Co., the landmark Colorado Supreme Court decision which dramatically changed Colorado oil and gas law. The case was a class action made up of 2,500 members in which the class alleged that the producer had underpaid royalties because the gas was not in marketable condition until after it had been processed into residue gas and natural gas liquids. The jury disagreed and found that the gas was in marketable condition at the wellhead and that the producer was properly paying royalties to the class.

Mr. Shaheen's experience also includes personal injury and products liability litigation. He has represented automobile manufacturers and distributors, heavy equipment manufacturers, military contractors and pharmaceutical companies.

Mr. Shaheen has defended and tried criminal cases, ranging from a criminal action brought for violation of the Resource Conservation and Recovery Act to first-degree murder.

Mr. Shaheen has been listed in The Best Lawyers in America (natural resources litigation) since 1999and was elected for inclusion in Colorado Super Lawyers for Energy and Natural Resources. He is admitted to practice in the state of Colorado.