MATTSON TECHOLOGY ANNOUNCES AVAILABILITY OF 2004 FOURTH QUARTER AND YEAR-END FINANCIAL RESULTS AND WEBCAST

FREMONT, Calif.- January 11, 2005 - Mattson Technology, Inc. (NASDAQ: MTSN), a leading supplier of advanced process equipment used to manufacture semiconductors, today announced that the Company will host a conference call on Wednesday, January 26, 2005 at 5:30 p.m. Eastern Time (2:30 p.m. Pacific Time). The conference call will include a discussion of 2004 fourth quarter and year-end financial results and current business conditions.

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