New Chief Operating Officer Heads to Gran Tierra's Calgary HQ

Gran Tierra has announced that Shane P. O'Leary will be joining the company as Chief Operating Officer effective March 2, 2009. Mr. O'Leary, whose regional experience includes South America, North Africa, the Middle East, the former Soviet Union, and North America, will be based out of the Calgary corporate head office and report to Dana Coffield, the company's President and Chief Executive Officer.

Prior to joining Gran Tierra Energy, Mr. O'Leary was President and Chief Executive Officer of First Calgary Petroleums Ltd., an oil and gas company actively engaged in exploration and development activities in Algeria. From 2002 to 2006, Mr. O'Leary worked for Encana Corporation where his positions included Vice President of Development Planning and Engineering, as well as Vice President Brazil Business Unit. From 1985 to 2002 he worked for the Amoco Production Company/BP Exploration where he occupied numerous senior finance, planning, and business development positions with assignments in Canada, U.S.A., Azerbaijan and Egypt, culminating in his role as Business Development Manager for BP Alaska Gas. Early in his career Mr. O'Leary worked as a Corporate Banking Officer for Bank of Montreal's Petroleum group in Calgary, a Reservoir Engineer for Dome Petroleum, and as a Senior Field Engineer for Schlumberger Overseas, S.A. in Kuwait.

Commenting on the addition to the executive team, Mr. Coffield stated, "It is with great pleasure that the Board of Directors makes today's announcement. Shane brings over 30 years of international oil and gas experience in operations, finance, planning, and business development to our group. The breadth and depth of his global experience is perfectly complementary with the business strategy of the company and we expect that he will play a significant role in supporting the continued growth of our company."

Mr. O'Leary, 52, earned his Bachelor of Science degree in chemical engineering from Queen's University in Kingston, Ontario and his Masters in Business Administration from the University of Western Ontario in London, Ontario. He is a member of the Canadian National Committee of the World Petroleum Council and The Association of Professional Engineers, Geologists, and Geophysicists of Alberta (P. Eng).