MIAMI--Sept. 23, 1999--MasTec, Inc. (NYSE:MTZ) announced today that Olaf Olafsson, president of Advanta Corporation, has been elected to MasTec's Board of Directors.
    Mr. Olafsson is president of Advanta, a financial services company with $22 billion in assets under management and 2,400 employees. Mr. Olafsson is also a member of the Board of Directors of Scholastic Corp. (NASDAQ:SCHL), a global children's publishing and media company. Previously, Mr. Olafsson was the founder and president of Sony Interactive Entertainment, Inc., an interactive entertainment software and hardware unit of Sony Corporation with operations in the United States and Europe. While at Sony Interactive, he was responsible for the development of the much-acclaimed Playstation.
    "We are very pleased to welcome to MasTec's Board a person with the proven leadership skills and technological know-how of Mr. Olafsson," said Jorge Mas, MasTec's Chairman. "His experience, customer relationships and knowledge of the technology sector will benefit greatly several of our service lines, particularly Switching & Transmission and Network & Internet Services."
    MasTec is a preeminent end-to-end telecommunications and energy infrastructure service provider in North America. MasTec builds, installs and maintains internal and external networks supporting the Internet, Internet-related applications, and other communications and energy facilities for leading telecommunications, cable television, energy and Fortune 500 companies.

    MasTec. Building the e-World.(SM)

CONTACT:
MasTec, Inc.
Miami
Carmen M. Sabater, Senior Vice President & CFO 305-406-1866
csabater@mastec.com