Mattson Technology, Inc. Announces Participation in Upcoming Investor Conferences

  Mattson Technology, Inc. (NASDAQ: MTSN), a leading supplier of advanced process equipment used to manufacture semiconductors, today announced its participation at two investor conferences in October and November. At each conference, management will provide an overview of the Company and will discuss its competitive position and future prospects.

Houlihan Lokey 2011 Technology, Media, Telecom & Gaming Conference

Date: Thursday, October 27, 2011 Presentation Time: 1:40 p.m. ET, with one-on-one meetings held throughout the day Conference Location: Grand Hyatt Hotel in New York, NY Presenters: David Dutton, President & CEO; Mike Dodson, Executive VP & CFO

The presentation will be webcast live via http://www.hl.com/conference/tmt2011/live/, and will be available for replay for 90 days following the conference in the investor relations section of Mattson Technology's website at www.mattson.com.

For more information about the conference or to schedule a one-on-one meeting with Mattson Technology management, please contact your Houlihan Lokey representative or email [e-mail].

TechAmerica AeA 2011 Classic Financial Conference

Date: Monday, November 7, 2011 Presentation Time: 10 presentations between 8:30 a.m. and 4:45 p.m. PT Conference Location: Manchester Grand Hyatt San Diego in California Presenter: Mike Dodson, Executive VP & CFO

One of the presentations will be webcast. The presentation and webcast details will be made available for the financial community and investors in the investor relations section of Mattson Technology's website at www.mattson.com.

For additional information about this year's Classic Financial conference, visit www.techamerica.org/classic or call [phone].

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, and operate in three primary product sectors: dry strip, rapid thermal processing and etch. 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/[phone]. Internet: www.mattson.com.

Mattson Technology Contact J. Michael Dodson Chief Financial Officer Mattson Technology, Inc. tel [phone] fax [phone] [e-mail] Investor & Media Contact Laura Guerrant-Oiye Principal Guerrant Associates tel [phone] [e-mail]