Samuel K. Skinner was elected a director of Express Scripts in February 2004. Mr. Skinner has been Of Counsel with the law firm of Greenberg Traurig, LLP since 2004. Mr. Skinner previously served as President, Chief Executive Officer and a director of USF Corporation (formerly USFreightways Corporation) or "USF", a transportation, freight forwarding and supply chain management company, from 2000 until his retirement in 2003. Mr. Skinner was also Chairman of the Board of USF from 2001 until his retirement. Mr. Skinner is also a director of Navigant Consulting, Inc., Midwest Air Group, Inc., Diamond Management and Technology Inc., Dade Behring Holdings, Inc., and the Chicago Board Options Exchange.