MATTSON TECHNOLOGY TO PRESENT AT SILICON VALLEY BANK TECHNOLOGY INVESTORS FORUM

FREMONT, Calif.- September 2, 2004 - Mattson Technology, Inc. (NASDAQ: MTSN), a leading supplier of advanced process equipment used to manufacture semiconductors, today announced that Ludger H. Viefhues, chief financial officer, will be presenting at the Silicon Valley Bank Technology Investors Forum on Thursday, September 9, 2004 at 3:20 p.m. Pacific Time. This year’s conference will be held September
8-9, 2004 at the Ritz-Carlton Hotel in San Francisco, California.

The presentation will be webcast live via the Internet, accessible on Mattson’s corporate website at www.mattson.com under the 'Investors' section. A replay will be available to the public on Mattson’s website for one week following the live broadcast.

About Mattson Technology, Inc.

Mattson Technology, Inc. is a leading supplier of semiconductor wafer processing equipment used in the fabrication of integrated circuits. The company’s dry strip and RTP equipment utilize innovative technology to deliver advanced processing capabilities on high-productivity platforms for the fabrication of current- and next-generation devices. Since beginning operations in 1989, the company’s core vision has been to help bring technology leadership and productivity gains to semiconductor manufacturers worldwide. For more information, please contact Mattson Technology, Inc., 47131 Bayside Parkway, Fremont, Calif. 94538. Telephone: (800) MATTSON/(510) 657-5900. Fax: (510) 492-5911. Internet: www.mattson.com.