MATTSON TECHNOLOGY SCHEDULES FOURTH QUARTER AND YEAR END EARNINGS CONFERENCE CALL

FREMONT, Calif. January 17, 2001- Mattson Technology, Inc. (Nasdaq: MTSN), a leading supplier of advanced process equipment used to manufacture semiconductors, today announced it will be hosting a conference call on Wednesday, January 31, 2001, beginning at 5:00 EST. The conference call will cover the fourth quarter earnings report and end of year figures for fiscal 2000.

The conference call will also be simultaneously accessible to all interested listeners via an audio webcast that can be heard through Mattson’s home page: www.mattson.com. A conference call replay will be available for one week following the live broadcast by accessing the company website’s investor information.

About Mattson Technology, Inc.

Mattson Technology, Inc. is a leading supplier of semiconductor wafer processing equipment used in "front-end" fabrication of integrated circuits. The company is a market leader in dry strip and RTP equipment, and its products combine advanced process technology on high-productivity platforms backed by industry-leading support. Since beginning operations in 1989, the company’s core vision has been to help bring technology leadership and productivity gains to semiconductor manufacturers worldwide. Headquartered in Fremont, Calif., the company maintains sales and support centers throughout the United States, Europe and Asia. 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.