MTSN Mattson Technology, Inc.

Mattson Technology, Inc. (NASDAQ: MTSN), a leading supplier of advanced process equipment used to manufacture semiconductors, today announced that the Company will co-host the CEO Investor Summit -- a forum that will bring investors and analysts together with executives from six leading capital equipment companies in an efficient, relaxed atmosphere. The CEO Investor Summit will be held on Wednesday, July 15, 2009 from 4:00 to 6:00 pm Pacific Time at the Four Seasons Hotel in San Francisco. Mattson Technology President & Chief Executive Officer David Dutton and Chief Financial Officer Andy Moring will represent Mattson Technology.

The CEO Investor Summit is scheduled to coincide with the SEMICON West and Intersolar Conferences, which will be held in San Francisco July 14-16. Joining Mattson Technology as co-hosts are: Intevac Inc, Kulicke & Soffa,Inc., LTX-Credence Corporation, Nanometrics Inc., and Ultratech, Inc. This event is by invitation, and open only to accredited investors and research analysts.

Investors and analysts interested in meeting with Mattson Technology executives should RSVP to Laura Guerrant-Oiye at lguerrant@guerrantir.com or call (808) 882-1467 by July 10, 2009.

About Mattson Technology, Inc.

Mattson Technology, Inc. designs, manufactures and markets semiconductor wafer processing equipment used in the fabrication of integrated circuits. We are a leading supplier of plasma and rapid thermal processing equipment to the global semiconductor industry. Through manufacturing and design innovation, we have produced technologically advanced systems that provide productive and cost effective solutions for customers fabricating current- and next-generation semiconductor devices. For more information, please contact Mattson Technology, Inc., 47131 Bayside Parkway, Fremont, CA, 94538. Telephone: (800) MATTSON/(510) 657-5900. Internet: www.mattson.com.

Mattson Technology Contact: Andy Moring Mattson Technology, Inc. tel 510-657-5900 fax 510-492-5963 andy.moring@mattson.com Investor & Media Contact: Laura Guerrant-Oiye Guerrant Associates tel 808-882-1467 lguerrant@guerrantir.com