For more information, contact:

Mike El-Hillow Advanced Energy Industries, Inc. 970.407.6570

Cathy Kawakami Advanced Energy Industries, Inc. 970.407.6732 cathy.kawakami@aei.com

Fort Collins, Colo., March 6, 2003—Advanced Energy Industries, Inc. (Nasdaq: AEIS), a leading global provider of critical solutions used in the production of semiconductors, flat panel displays, data storage products and other advanced applications, today announced the appointment of Craig Jeffries, 43, as executive vice president and chief marketing officer, reporting to Doug Schatz, chairman and chief executive officer. He will join Advanced Energy by mid-April.

Mr. Jeffries will lead all corporate marketing activities at Advanced Energy. He brings over 20 years of marketing leadership experience in business planning and strategy development, product marketing, business development, and e-business for global technology firms. Prior to joining Advanced Energy, Mr. Jeffries held roles as President and founder of Ensenyo Software, as Chief Marketing Officer at Exostar, LLC, and as Vice President of Marketing and e-Business at Honeywell International. Previously, Mr. Jeffries held various marketing and product development roles over a fifteen year career at Hewlett Packard Company. He holds a B.S. in Electrical Engineering from the University of California, Irvine and an M.S. in Finance from the University of Denver.

Mr. Schatz said, “Craig brings key strategic marketing expertise to the Advanced Energy team. He will work with me and our product group marketing executives as we continue to build upon our comprehensive portfolio. This portfolio includes integrated power, flow, source, and thermal technology solutions. These products are used in the manufacture of semiconductors, data storage products, flat panel displays, and architectural glass. While the industries that we serve offer us tremendous growth potential, they are also going through significant transformation, especially the semiconductor capital equipment market. Craig’s leadership will be instrumental as we develop new opportunities to leverage Advanced Energy’s extensive technology platforms into current and new industry segments.”

About Advanced Energy
Advanced Energy is a global leader in the development and support of process-centered technologies 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 advanced product applications. Leveraging a diverse product portfolio and technology leadership, AE creates solutions that maximize process impact, improve productivity and lower cost of ownership for its customers. This portfolio includes a comprehensive line of technology solutions in power, flow and thermal management, plasma and ion beam sources, and integrated process monitoring and control for original equipment manufacturers (OEMs) and end-users around the world. AE operates globally from regional centers in North America, Asia and Europe, offering 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