Advanced Energy Industries Inc.

Thomas Rohrs was appointed as a Director of the Company in December 2004. He became Chairman of the Board and CEO in April 2006 and in February 2009 he became Executive Chairman of the Board. Mr. Rohrs presently serves on the board of Magna Design Automation, Inc., Ultraclean Technologies, and several private companies. In addition, he is an adviser and consultant to a number of companies both public and private. Mr. Rohrs spent five years with Applied Materials Inc., most recently as Senior Vice President, Global Operations, and was also a member of the company’s Executive Committee. Prior to that, he held executive positions with Silicon Graphics, MIPS Computer Systems and Hewlett-Packard Company’s Personal Computer Group. Mr. Rohrs holds a masters degree from Harvard Business School and a bachelors degree in Mechanical Engineering from Notre Dame Unitversity.

has served as a director since January 2001. Dr. Betz also serves as Chairman of the Company's Compensation Committee. Since August 2005, Dr. Betz has served as President and Chief Executive Officer of Advanced Energy Industries, Inc. Dr. Betz served as Chief Executive Officer of West STEAG Partners from August 2001 until August 2005, as Chairman of the Management Board and Chief Executive Officer of STEAG Electronic Systems AG from January 1996 to July 2001, and as a member of the Management Board of STEAG Electronic Systems AG from October 1992 to July 2001. Dr. Betz served as a member of the Management Board of STEAG AG from January 1997 to July 2001.

Lawrence D. Firestone joined Advanced Energy in August 2006 as executive vice president and chief financial officer. He was most recently chief financial officer at Applied Films Corporation, a $240 million thin-film deposition equipment provider based in Longmont, Colorado, where he lead several strategic initiatives such as global manufacturing, gross margin improvement, acquisition strategy, integration, and public market financing. Prior to joining Applied Films, Mr. Firestone served as vice president and chief operating officer of Avalanche Industries, an electronics manufacturing services company located in Colorado Springs, Colorado. Earlier, he held finance and operations positions at Woolson Spice and Coffee Company, TechniStar Corporation and Colorado Manufacturing Technology, Inc. in addition to consulting work for several early-stage technology companies. Mr. Firestone currently serves on the board of directors, and is the chairman of the audit committee of Amtech Systems, Inc., a publicly held semiconductor equipment company.

Douglas S. Schatz is a co-founder of Advanced Energy and has been its chairman and a director since its incorporation in 1981. He also served as chief executive officer until August 2005 and as president until July 1999. In March 2001, Mr. Schatz was re-appointed as president. Since December 1995, Mr. Schatz has served as a director of Advanced Power Technology, Inc., a company which provides high power, high voltage, and high performance semiconductors and power modules.