5 Noviembre 2007

GRAN TIERRA ENERGY TO PRESENT AT THE SMH CAPITAL INVESTOR GROWTH CONFERENCE ON FRIDAY, NOVEMBER 9, 2007 IN NEW YORK

CALGARY, CANADA, November 5, 2007 – Gran Tierra Energy Inc. (GTRE.OB) today announced that the company’s senior management will present an overview of the company’s business at the SMH Investor Growth Conference on Friday, November 9, 2007 at 10:30 a.m. Eastern time.

What: Gran Tierra Energy Inc. Presentation at the Sanders Morris Harris Investor Growth Conference

When: Friday, November 9, 2007, 10:30 a.m. Eastern Time

Where: The New York Palace Hotel – 455 Madison Ave, New York, NY

Conference one-on-one meetings:

For further information about the Third Annual Investor Growth Conference or conference one-on-one meetings, please contact your SMH Capital sales representative or Amy Gottenberg at (212) 893-1103, amy.gottenberg@smhgroup.com

Non-conference one-on-one meetings:

For one on one meetings outside the conference on Thursday November 8th or Friday November 9th please contact the following:

Al Palombo, Cameron Associates, (212) 554-5488, al@cameronassoc.com

About Gran Tierra Energy Inc.:

Gran Tierra Energy Inc. is an international oil and gas exploration and production company, headquartered in Calgary, Canada, incorporated and traded in the United States and operating in South America. The company holds interests in producing and prospective properties in Argentina, Colombia and Peru. To date, the company has pursued a strategy that focuses on establishing a portfolio of producing properties, development and exploration opportunities, through selective acquisitions, to provide a base for future growth. Additional information concerning Gran Tierra Energy is available at www.grantierra.com. Investor inquiries may be directed to info@grantierra.com or 1-800-916-GTRE