 In the United States, he has testified before the United States Congress on higher education financing and to the Federal Aviation Authority.He has consulted to companies such as Mellon Financial Corporation, Texas Commerce Bank, First City National Bank of Houston, Georgia Power Company, Houston Natural Gas Company, Tenneco, National Service Industries, Brown and Root, Exxon Corporation, Lexecon, Scientific Games, the Grand Rapids, Denver, Los Angeles, and the Port Authority of New York and New Jersey airports, etc.He is also well known for his expert witness appearances in major lawsuits involving antitrust matters, intellectual property, and airport rate and charges to airlines.