Mr. Thomas Dea of West Face reports

WEST FACE CAPITAL FILES NOMINATIONS FOR SIX NEW DIRECTORS OF GRAN TIERRA ENERGY

West Face Capital Inc. has filed its notice of intention to nominate six experienced business leaders for election to the board of directors of Gran Tierra Energy Inc. at the company's annual meeting, which was scheduled for June 24, 2015.

West Face manages funds that beneficially own approximately 9.8 per cent of Gran Tierra. It believes the current four-member board of Gran Tierra is responsible for chronic underperformance, resulting in the company's market value falling by 59 per cent in the past four years.

Gran Tierra has acknowledged the underperformance and has also accepted West Face's recommendation of a strategic shift to refocus the company on the development of its assets in Colombia instead of allocating capital to high-risk frontier exploration in other parts of South America.

"We believe the current board of Gran Tierra is not aligned with shareholders' interests, lost its strategic focus and failed to control overhead," said Thomas Dea, partner at West Face. "Our view is that the new proposed chief executive officer and value-enhancing plan represent the best path forward for shareholders. It is time to fix GTE."

The six West Face nominees include Gary Guidry, a proven value creator in the oil and gas industry, who is the prospective new chief executive officer. The last four companies at which Mr. Guidry was chief executive officer have earned an average annual return of 45 per cent.

The individuals in the West Face slate are as follows.

Peter Dey

• More than 40 years of experience in law, investment banking, corporate governance and on boards of directors;
• Former chair of the Ontario Securities Commission and adviser to the Toronto Stock Exchange and the Organization for Economic Co-operation and Development (OECD) on governance.

Gary Guidry

• Proven value-creating chief executive officer with 35 years of experience in international exploration and development, including South America;
• 2014 Oil Council chief executive officer of the year.

Robert Hodgins

• More than 30 years of experience in finance positions, including as chief financial officer of major public energy companies;
• Serves as director and chairman of the audit committee at several high-profile public oil and gas companies.

Ronald W. Royal

• Senior executive and corporate director with an engineering background;
• Over 35 years of experience in international upstream operations with global energy companies.

David Smith

• Chairman of a major energy-related company with 30 years of background in investment banking, research and management;
• Significant board experience with a record of value creation.

Brooke Wade

• Founder and successful chief executive officer of international chemical companies and with more than 35 years of proven entrepreneurial leadership;
• Extensive finance, audit and governance experience across several industries, including oil and gas.

Further background on the nominees is available in the West Face news release and letter to the board on April 21, 2015.

West Face also called on Gran Tierra to confirm the annual meeting date of June 24, 2015, as noted on the company's website as recently as April 23, 2015. However, the reference to the coming annual meeting was deleted by the next day.

"We see no need and no excuse for a delay in holding the annual meeting," said Mr. Dea. "We believe any attempt to postpone the meeting will be recognized as the current board's attempt to entrench itself."

West Face believes Gran Tierra shareholders are best served by action to replace the current board as soon as possible to minimize its opportunities to misuse the company's remaining capital resources, as it has in the past. Its record for capital allocation should be cause for concern for all GTE shareholders.

We seek Safe Harbor.