Aspen Technology, Inc. Names Bradley Miller Chief Financial Officer; Miller Joins Company's Senior Management Team, Bringing over Twenty Years Executive Leadership and Financial Management Experience.

CAMBRIDGE, Mass. -- Aspen Technology, Inc. (NASDAQ: AZPN), today announced the appointment of Bradley T. Miller to the position of senior vice president and chief financial officer (CFO). Miller, who joins AspenTech's senior management team effective September 19th, brings significant financial management and executive leadership to the Company. As CFO, Miller will be responsible for the Company's global financial operations and will oversee all treasury, investor, and information technology functions. Miller will report to Mark Fusco, president and chief executive officer of AspenTech.

"Over the past year and half, AspenTech has taken decisive and strategic steps which position the Company to continue to lead the market in process manufacturing software solutions," said Fusco. "In addition to ensuring that AspenTech operates with solid financial controls, Brad's two decades of experience managing a diverse set of public technology companies coupled with his executive leadership skills will be instrumental in driving the Company's strategic plans forward in the most efficient and effective manner possible."

"I'm excited to be joining the Aspen Technology team at such a significant time," said Miller. "I'm looking forward to working with management and the board of directors to build upon the Company's momentum and to help drive the Company's continued growth."

Miller brings a wealth of experience to AspenTech, including his most recent role as CFO at Viisage Technology, a publicly traded identity solutions hardware and software company where he successfully managed a $100 million private equity investment and the recent merger with Identix. Prior to joining Viisage in September 2005, Miller served as vice president, finance and corporate controller of Sonus Networks where he successfully steered the company through a period of substantial challenge and change in its financial operations. Miller also held executive financial management roles at Sapient, Juniornet and Wang Global. He previously was a member of the audit practice with Coopers & Lybrand where he earned his C. P. A. license. Mr. Miller has a B. A. from the College of William and Mary, and an MBA from the University of New Hampshire.

About AspenTech

Aspen Technology, Inc. provides industry-leading software and professional services that help process companies improve efficiency and profitability by enabling them to model, manage and control their operations. AspenTech's integrated aspenONE(TM) solutions are aligned with the key industry business processes, providing manufacturers the capabilities they need to optimize operational performance, make real-time decisions and synchronize the plant and supply chain. Over 1,500 leading companies already rely on AspenTech's software, including Bayer, BASF, BP, Chevron Corporation, DuPont, ExxonMobil, Fluor, GlaxoSmithKline, Sanofi-Aventis, Shell, and Total. For more information, visit www.aspentech.com.

This press release may contain forward-looking statements for purposes of the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. Actual results may vary significantly from AspenTech's expectations based on a number of risks and uncertainties, including, without limitation: AspenTech's plan to improve operational performance may not be implemented effectively; AspenTech has identified material weaknesses in its internal controls with respect to software license revenue recognition and other matters, that, if not remedied effectively, could result in material misstatements; risks around securities litigation and investigations; AspenTech's lengthy sales cycle makes it difficult to predict quarterly operating results; fluctuations in AspenTech's quarterly operating results; AspenTech's dependence on customers in the cyclical chemicals, petrochemicals and petroleum industries; the possibility of new accounting standards or the interpretation of existing accounting standards affecting our financial results; AspenTech's ability to raise additional capital as required; intense competition; AspenTech's need to develop and market products successfully; reliance on relationships with strategic partners; challenges associated with international operations; and other risk factors described from time to time in AspenTech's periodic reports filed with the Securities and Exchange Commission. AspenTech cannot guarantee any future results, levels of activity, performance, or achievements. AspenTech expressly disclaims any current intention to update forward-looking statements after the date of this press release.

AspenTech, aspenONE, Aspen PIMS, Aspen Orion and the aspen leaf logo are trademarks of Aspen Technology, Inc., Cambridge, Mass.