American Telesource Announces Enhancements to Its Management Team.

Business Editors & High-Tech Writers

SAN ANTONIO--(BUSINESS WIRE)--April 11, 2000

American TeleSource International Inc. (AMEX:AI) today announced K. Earl Posey has joined the Company as Senior Vice President Human Resources and Administration.

In addition, ATSI's Board of Directors has elected J. Christopher Cuevas to the position of Vice President Corporate Controller and Karen R. Mella to the position of Vice President Investor Relations and Corporate Communications, effective immediately.

K. Earl Posey.

His 30 years of managerial experience in the fields of human resources and manufacturing, includes positions with Nortel Networks Inc., Black and Decker Manufacturing Company, ITT Telecommunications, A+ Communications and PMT Services Inc. During his 12 years at Nortel as U.S. Director of Employee and Labor Relations, Earl was responsible for the development of the company's strategic policies, programs and procedures as they related to employee and labor relations for this $4 billion, 24,000 employee manufacturer of telecommunications equipment. While serving as Vice President Administration at A+ Communications and Corporate Director of Human Resources at PMT Services, he was involved in various merger and acquisition activities.

J. Christopher Cuevas.

Chris joined ATSI in December 1994 as Manager of Financial Reporting. In August 1998, he was promoted to his recent position of Corporate Controller. In his new capacity as Vice President Corporate Controller, Chris will be responsible for establishing corporate policies and procedures, overseeing the Company's accounting department, both in the United States and Latin America, and facilitating the Company's Security and Exchange Commission filings.

Karen R. Mella.

Karen joined ATSI in March 1998 as Director Investor Relations. During the past two years she has implemented a comprehensive plan to increase the visibility of the Company throughout the investment community. These efforts contributed to the increase in ATSI's market cap from approximately $97 million in April 1998 to over $385 million in April 2000 and the listing of ATSI's equity on The American Stock Exchange.

Arthur L. Smith, Chairman and CEO, stated, "I am excited to announce these new additions to ATSI management. Earl brings with him a wealth of experience that will be a vital component as we continue to expand our operations."

Smith further added, "In their previous positions at ATSI, Chris and Karen have proven themselves to be key and integral assets to the overall success of the Company. Undoubtedly, they will complement the management team's strengths and support the Company's growth initiatives."

In addition, the Company announces the resignation of Craig K. Clement from the position of Senior Vice President Corporate Development.

Smith commented, "Through his entrepreneurial spirit and strong leadership, Craig has been an important contributor to the Company's success over the past six years. We deeply regret Craig's decision to leave, but fully support him in his future endeavors."

Craig K. Clement, commented, "While I greatly appreciate the opportunity to have been a part of ATSI's many achievements, I feel my personal objectives will be best served by making this transition. My desire to manage lies more in the start-up phase of an organization, and ATSI has moved well beyond this stage. I am leaving with confidence that ATSI is in the hands of a solid management team, with the right tools and assets in place to continue succeeding as a leader in the Latin telecommunications arena."