MTSN Mattson Technology, Inc.

Mattson Technology, Inc. (NASDAQ: MTSN), a leading supplier of advanced process equipment used to manufacture semiconductors, announced that the company will host a conference call on Wednesday, October 21, 2009 at 6:00 p.m. Eastern Time (3:00 p.m. Pacific Time). The conference call will cover 2009-third quarter financial results and current business conditions.

Mattson will also webcast a slide presentation in conjunction with the conference call. To access the live webcast and slide presentation, please visit Mattson's website www.mattson.com under the 'Investors' section.

To access the live conference call, please dial (913) 312-4374.

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. designs, manufactures and markets semiconductor wafer processing equipment used in the fabrication of integrated circuits. We are a leading supplier of plasma and rapid thermal processing equipment to the global semiconductor industry. Through manufacturing and design innovation, we have produced technologically advanced systems that provide productive and cost effective solutions for customers fabricating current- and next-generation semiconductor devices. For more information, please contact Mattson Technology, Inc., 47131 Bayside Parkway, Fremont, CA, 94538. Telephone: (800) MATTSON/(510) 657-5900. 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