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                                                                   EXHIBIT 99.1

CONTACTS:
RICHARD BECK                                   CATHY KAWAKAMI
ADVANCED ENERGY INDUSTRIES, INC.               ADVANCED ENERGY INDUSTRIES, INC.
970-407-6204                                   970-407-6732
DICK.BECK@AEI.COM                              CATHY.KAWAKAMI@AEI.COM

FOR IMMEDIATE RELEASE


            ADVANCED ENERGY ANNOUNCES PENDING RETIREMENT OF PRESIDENT
        JIM GENTILCORE NAMED EXECUTIVE VICE PRESIDENT TO HEAD OPERATIONS

FORT COLLINS, COLORADO (FEBRUARY 20, 2001)--Advanced Energy (Nasdaq: AEIS) today
announced the pending retirement of Dr. Hollis Caswell, 69, current President
and Chief Operating Officer.

The company has named Jim Gentilcore, age 48, current President of the EMCO
subsidiary, as Executive Vice President in charge of operations. Doug Schatz,
Chairman and Chief Executive Officer, will assume the title of President when
the retirement of Dr. Caswell becomes effective.

Dr. Caswell will continue as President and Chief Operating Officer for the next
few months in order to assist in a smooth transition, and afterward, will serve
in an as-needed advisory role to Mr. Gentilcore and Mr. Schatz.

"I join everyone at Advanced Energy in thanking Holly for the significant
contributions he has made over the past four years," said Doug Schatz, Chairman
and Chief Executive Officer. "Advanced Energy has grown three-fold since Holly
joined us, and he has structured the company to efficiently and effectively
manage that growth. He implemented processes and procedures that will continue
to help us grow the company and enable us to meet our strategic objectives.

"We have great confidence in Jim Gentilcore's abilities to position Advanced
Energy for our next phase of growth," said Mr. Schatz. "He was the natural
choice to assume Holly's duties in leading the company's day-to-day operations.
Jim has a remarkable track record for leadership and results in his five years
with Advanced Energy. These skills are essential as the company expands its
total available market opportunity through recent acquisitions and new product
development, and continues to execute our integration strategy.

"While President of our AE Voorhees (formerly RF Power Products) subsidiary, Jim
implemented a streamlined manufacturing process that improved operational
efficiencies and increased the subsidiaries' gross margins to bring them in line
with our corporate




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financial model," said Mr. Schatz. "In his new role as Executive Vice President,
Jim will be responsible for leading the functional organizations and operations
as well as the implementation of the organization of our new Strategic Business
Units."

Mr. Gentilcore joined Advanced Energy in 1996 as vice president of sales and
marketing and was president of AE Voorhees from November 1999 to January 2001
where he led the post-merger integration of the former RF Power Products. Last
month, he was named President of the EMCO subsidiary, and he will continue his
responsibilities at EMCO in addition to serving in his new role at the company.
Before joining Advanced Energy Mr. Gentilcore was Vice President of Corporate
Marketing at MKS Instruments and earlier, a vice president at Helix Technology.

ABOUT ADVANCED ENERGY
Advanced Energy is a global leader in the development, marketing, and support of
integrated technology solutions that are central in the manufacture of
semiconductors, data storage products, and flat panel displays as well as other
mission-critical power applications. AE's comprehensive suite of custom
subsystems for vacuum processing includes power conversion and control
solutions, process monitoring and machine control tools, ion-beam sources,
dynamic temperature control and measurement products, mass flow systems, and
plasma abatement technologies. AE's URL is www.advanced-energy.com

SAFE HARBOR STATEMENT
This press release contains forward-looking statements within the meaning of the
Private Securities Litigation Reform Act of 1995. These forward-looking
statements represent the companies' reasonable judgments with respect to future
events, but are subject to risks and uncertainties that could cause actual
results to differ materially from those described in the forward-looking
statements. Among the factors that could cause such different results are: AE
might not be able to meet its expectations for growth, the company may not be
able to manage for expected growth, the company's integration strategy through
acquisition and new product development operations could result in unanticipated
costs or substantial diversion of management's attention. These and other
cautionary statements are discussed in Advanced Energy's SEC reports, including
its Forms 10-Q and most recent annual report on Form 10-K. The company continues
to be susceptible to fluctuations in quarterly and annual revenues and operating
results and the volatility and cyclicality of the semiconductor and
semiconductor capital equipment industries. The company assumes no obligation to
update the information in this release. Free copies of this and other documents
are available from the SEC at www.sec.gov or Advanced Energy at 1625 Sharp Point
Drive, Fort Collins, CO 80525; 970-221-4670.




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