MTSN Mattson Technology, Inc.

Mattson Technology, Inc. (NASDAQ: MTSN), a leading supplier of advanced process equipment used to manufacture semiconductors, today announced that on Wednesday, July 29, 2009, at 2:00 PM Pacific Time (5:00 PM Eastern Time), the Company will hold a conference call to review the following topics: 2009 second quarter financial results, current business conditions, the near-term business outlook and guidance for the third quarter of 2009. The conference call will be simultaneously webcast at www.mattson.com under the "Investors" section.

To access the live conference call, please dial (719) 325-4837.

Mattson will also webcast a slide presentation in conjunction with the conference call, which can also be accessed at www.mattson.com under the "Investors" section.

A digital 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.

Mattson Technology Contact Andy Moring tel +1-(510) 492-6241 fax +1-(510) 492-5963 andy.moring@mattson.com Investor & Media Contact Laura Guerrant-Oiye Guerrant Associates tel 808-882-1467 lguerrant@guerrantir.com