DULLES, Va., Dec 11, 2001 /PRNewswire via COMTEX/ -- Mr. Michael R. Williams has been named Senior Vice President and Treasurer of Orbital Sciences Corporation (NYSE: ORB), one of the world's leading providers of commercial and government space systems, the company announced today. Mr. Williams's background includes over 20 years of banking experience with Bank of America in senior level positions. At Orbital, he will oversee the company's banking relationships and treasury functions, as well as have responsibility for capital markets, treasury management, insurance, foreign exchange and real estate activities.

Mr. Garrett E. Pierce, Orbital's Executive Vice President and Chief Financial Officer, said, "We are very pleased that Mike Williams has joined our management team. Mike's extensive background in structuring and executing financial transactions will be a major asset for the company."

Prior to joining Orbital, Mr. Williams spent substantially all his career with Bank of America (formerly NationsBank), most recently serving as a Managing Director in Global Corporate and Investment Banking. He holds a Bachelor of Science degree in Business Administration from the University of Maryland and an MBA in Finance from the University of Michigan.

Orbital develops and manufactures affordable space systems, including satellites, launch vehicles, electronics and advanced space systems. Orbital is also involved with satellite-based networks that provide wireless data communications and high-resolution Earth imagery to customers around the world.

    More information about Orbital can be found at http://www.orbital.com

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SOURCE Orbital Sciences Corporation

CONTACT:          Barron Beneski, Public and Investor Relations, of Orbital
                  Sciences Corporation, +1-703-406-5528, or beneski.barron@orbital.com

URL:              http://www.orbital.com
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