MATTSON TECHNOLOGY ANNOUNCES PRESENTATION AT RBC CAPITAL MARKETS NORTH AMERICAN TECHNOLOGY CONFERENCE 2004

FREMONT, Calif.- July 27, 2004 - Mattson Technology, Inc. (NASDAQ: MTSN), a leading supplier of advanced process equipment used to manufacture semiconductors, today announced that the company will deliver a presentation at the RBC Capital Markets North American Technology Conference on Wednesday, August 4, 2004 at 11:00 a.m. Pacific Time (2:00 p.m. Eastern Time) at the Ritz-Carlton in Half Moon Bay, California.

The company's presentation will be simultaneously available to all interested listeners via an audio webcast on the Internet. For access, visit the company’s website, www.mattson.com, under the 'Investors' section. A replay of the presentation will be available 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.