MATTSON TECHNOLOGY ANNOUNCES LIVE WEBCASTS OF TWO UPCOMING INVESTOR CONFERENCES

FREMONT, Calif.- October 19, 2004 - Mattson Technology, Inc. (NASDAQ: MTSN), a leading supplier of advanced process equipment used to manufacture semiconductors, today announced that the company will present at two investment community conferences next week:

• October 26, 2004—JPMorgan Small Cap Conference, Boston, MA, 1:30 p.m. Eastern Time
• October 27, 2004—21st Annual Prudential Equity Group Technology Conference, New York, NY, 10:25 a.m. Eastern Time

Both presentations will be available via live webcasts, which can be accessed from Mattson’s web site at www.mattson.com. A replay of each webcast will be available to the public on the Mattson website for one week following the live broadcasts.

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..