MATTSON TECHOLOGY TO PRESENT AT RBC NORTH AMERICAN TECHNOLOGY CONFERENCE

FREMONT, Calif.- August 2, 2005 - Mattson Technology, Inc. (NASDAQ: MTSN), a leading supplier of advanced process equipment used to manufacture semiconductors, today announced that David L. Dutton, chief executive officer, will be presenting at the RBC North American Technology Conference on Thursday, August 4, 2005 at 11:00 a.m. Pacific Time. This year's conference will be held August 1-4, 2005 at the Four Seasons 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 or www.wsw.com/webcast/rbc32/mtsn. In addition to the live webcast, a replay will be available to the public on the Mattson website for one week following the live broadcast.

About Mattson Technology, Inc.

Mattson Technology, Inc. is the leading supplier of dry strip equipment and the second largest supplier of rapid thermal processing equipment in the global semiconductor industry. The company's strip and RTP equipment utilize innovative technology to deliver advanced processing performance and productivity gains to semiconductor manufacturers worldwide for the fabrication of current- and next-generation devices. 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.