MATTSON TECHOLOGY ANNOUNCES AVAILABILITY OF FIRST QUARTER 2007 EARNINGS AND WEBCAST

FREMONT, Calif.- April 10, 2007 - 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, April 25, 2007 at 2:30 p.m. Pacific Time (5:30 p.m. Eastern Time). The conference call will cover first quarter 2007 earnings 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 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.