For more information, contact:

Richard Beck
Advanced Energy Industries
Catherine Roberts
Financial Relations Board/San Francisco

Advanced Energy Appoints Seiichiro Tokuoka as President of Advanced Energy Japan

FORT COLLINS, Colorado (September 15, 1998)—Advanced Energy Industries, Inc. (Nasdaq: AEIS) announced the appointment of Seiichiro Tokuoka, 56, to the position of President of Advanced Energy Japan (AEJ). He replaces Takashi Majima, who is retiring for health reasons. Mr. Majima has been President of AEJ since its founding in 1987 and has contributed significantly to it growth.

Mr. Tokuoka comes to AE from MKS Instruments (MKS), where, in his most recent assignment, he managed the Global Accounts for major Japanese customers. Prior to that, he served as Vice President and General Manager of MKS Japan, a wholly owned subsidiary of MKS. For 13 years before joining MKS, Mr. Tokuoka was with Tokyo Electron Limited (TEL), where he served in various general management positions of increasing responsibility.

Doug Schatz, Chief Executive Officer of Advanced Energy, said, “We welcome Mr. Tokuoka as part of our team and believe that the strength of his experience will drive the growth that we plan for AEJ in the next decade. With his knowledge of the semiconductor equipment segment, we believe Mr. Tokuoka is particularly well positioned to advance our progress in the RF power market in Japan.”

Advanced Energy Profile
Advanced Energy Industries, Inc. was founded in 1981 and is the leading manufacturer of power delivery systems that are critical in the manufacturing of semiconductors, data storage media, flat panel displays, and other products using thin-film technology. Within its comprehensive product portfolio of direct current (DC), low/mid-frequency and radio frequency (RF) solutions, the company sells hundreds of different products critical in applications ranging from compact disks, digital video disks, flat panel displays, the most popular logic semiconductor devices, among many other applications. The Company’s stock is traded on Nasdaq under the symbol AEIS.

Safe Harbor Statement
Except for any historical information contained herein, the matters discussed in this news release are forward-looking statements that involve risks and uncertainties, including risks detailed from time-to-time in the Company’s Securities and Exchange Commission reports, including Form 10-K and Form 10-Q. The Company continues to be susceptible to fluctuations in quarterly and annual revenues and operating results and to the effects of economic conditions in Asia. Advanced Energy Industries assumes no obligation to update the information in this release.

For more information, access Advanced Energy’s web site at or for information via fax, no cost, dial 800-PRO-INFO, code AEIS.