For more information, contact:

Jim Donaldson Advanced Energy Industries, Inc. 970.407.6374

Marna Shillman Advanced Energy Industries, Inc. 970.407.6280 marna.shillman@aei.com

Fort Collins, Colo., September 5, 2002—Advanced Energy Industries (Nasdaq: AEIS) recently announced the appointment of Shaun Wilson to the position of Vice President of Marketing for the RF Power Management Division. Mr. Wilson, 41, has an extensive background in corporate and product marketing in the semiconductor industry. He will be responsible for refining, expanding, and deepening the long-range strategic marketing plans for AE’s well-established, comprehensive line of RF power products.

Bill Ruff, Vice President and General Manager for the RF Power Management Division, said, “Shaun is an extremely talented and experienced executive. We feel very fortunate to have him join us to lead the marketing efforts for our cutting-edge RF products. We have an exciting future and expect Shaun to greatly complement our industry-leading team.”

Mr. Wilson comes to Advanced Energy from Helix Technology Corporation, where he held key positions including Vice President of Marketing, and most recently Vice President and General Manager of the CTI-Cryogenics Business Unit. Prior to joining Helix he worked at Eaton Corporation in the Semiconductor Equipment Operations—Implant Systems Division (now Axcelis) as Director of Marketing. Mr. Wilson has an undergraduate degree in chemistry from the University of California.

About Advanced Energy
Advanced Energy is a global leader in the development, marketing and support of components and sub-systems critical to plasma-based manufacturing processes used in the production of semiconductors, flat panel displays, data storage products, compact discs, digital video discs, architectural glass, and other applications that require precise thin-film processes. AE offers a comprehensive line of technology solutions in power, flow and thermal management, plasma and ion beam sources, and integrated process monitoring and control to original equipment manufacturers (OEMs) and end-users around the world. AE operates in regional centers in North America, Asia and Europe, and offers global sales and support through direct offices, representatives and distributors. Founded in 1981, AE is a publicly-held company traded on Nasdaq National Market under the symbol AEIS. For more information, please visit our corporate website: www.advanced-energy.com