Mark Kiefer's clients have included airports, airlines, equipment manufacturers, defense contractors, law firms, trade associations, public transport operators, shippers, and agencies at all levels of government. Many of these client relationships are confidential, but a sample list of representative clients is provided below.

•  Air Transport Association

•  San Francisco International Airport

•  FedEx

•  Eclipse Aviation

•  BAE Systems

•  US Department of Transportation

•  California High Speed Rail Authority

•  Kaye Scholer LLP

•  Lockheed Martin

•  Massachusetts Port Authority

•  Transport Canada


•  Williams & Connolly

•  Federal Aviation Administration

•  Proskauer Rose

•  Steamship Authority

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