Mattson Technology Announces Availability of First Quarter 2011 Financial Results and Web Cast

FREMONT, CA, Apr 18 (MARKET WIRE) --
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, April 27, 2011 at 5:30
p.m. Eastern Time (2:30 p.m. Pacific Time). The conference call will
cover 2011 first quarter financial results and current business
conditions.

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

To access the live conference call, dial (970) 315-0417.

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

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