Calgary-based Suncor Energy has appointed Jay Thornton as executive vice president of refining and marketing, with responsibility for Suncor's downstream business in Canada and the US. Suncor has also announced other senior executive appointments.

Mr Thornton’s responsibilities will include refining operations, and industrial and retail marketing of refined products, as well as the company’s growing renewable energy business.

He was previously senior vice president, business integration and has held a variety of roles in corporate planning and strategy in Suncor’s oil sands and refining and marketing businesses. He replaces outgoing executive vice president Tom Ryley, who is leaving in March 2008.

In other appointments, Bart Demosky will take over from Mr Thornton as senior vice president of business integration. In his new role, Mr Demosky assumes responsibility for enterprise-wide business services and integration of technology and processes, including supply chain management.

Joel Croteau has been appointed senior vice president, natural gas and in-situ resources. In this role he will be responsible for continuing to develop Suncor’s natural gas production as a financial hedge against the company’s internal energy demands. He is also responsible for oil sands in situ subsurface technology and reservoir development.