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Steven Sterin and Cynthia "CJ" Warner. Images courtesy of Sapphire Energy and Celanese.

San-Antonio based downstream independent Tesero has tapped Steven Sterin as its new Executive Vice President and Chief Financial Officer and Cynthia “CJ” Warner as the company’s new Executive Vice President of Strategy and Business Development.

Sterin will take the reigns from the current CFO Scott Spendlove on August 18, 2014.

Spendlove is leaving the company after serving as CFO since 2010.

Warner’s appointment is effective October 6, 2014.

Sterin joins Tesoro from Dallas-based Celanese Corporation, a global technology and specialty materials company.

Sterin has held multiple financial leadership positions at Celanese including serving as Senior Vice President, Chief Financial Officer for the last seven years.

Sterin has also worked for St.Louis-based Reichhold, Inc. and Price Waterhouse LLP.

Warner will join Tesero from Sapphire Energy where she served as President, Chief Executive Officer, and Chairman of the Board over the past five years.

Warner is currently Sapphire’s Chairman of the Board.

San Diego-based Sapphire produces crude oil from algae.

Prior to joining Sapphire, Warner held numerous leadership positions with BP including Group Vice President of Global Refining and Group Vice President of Health, Safety, Security, Environmental & Technology.

Tesoro, through its subsidiaries, operates six refineries in the western US with a combined capacity of over 850,000 barrels per day and ownership in a logistics business which include a 35 percent interest in Tesoro Logistics and ownership of its general partner.

Tesoro’s retail- marketing system includes over 2,200 retail stations under the ARCO, Shell, Exxon, Mobil, USA Gasoline and Tesoro brands.