Duncan Nightingale

Artumas Group, Inc. explores and produces oil and gas. The company operates four business segments; Gas Operational, Midstream, Power and T&D Segments. The gas operational segment explores and develops oil and natural gas in Tanzania an Mozambique. The Midstream Segment processes, transports and produces oil and natural gas in Tanzania. The Power Segment generates electricity in Mtwara town in southeast Tanzania. The T&D Segment includes the rehabilitation and expansion of certain electricity transmission and distribution assets in southeast Tanzania. The company was founded on August 8, 2000 and is headquartered in Calgary, Canada.

Blacksteel Energy, Inc. operates as an oil and gas company. It engages in the exploration, development, and production of oil and natural gas. The firm's portfolio includes Crown oil sand leases in the Peace River area of northern Alberta, a working interest in a natural gas producing property in the Grassland area of Alberta and has farmed in on an oil exploration play in central Alberta. The company was founded in 2007 and is headquartered in Calgary, Canada.

Part of Gran Tierra Energy, Inc., Gran Tierra Energy Colombia Ltd. is a company based in Bogota, Colombia.