Delek US Holdings CFO Mark Cox has stepped down from that role after almost three and a half years. Taking his place is Assi Ginzburg, who has since 2004 held various senior positions at the Brentwood-based oil refiner and marketer.

Cox, who came to Delek after working as treasurer and investor relations chief at Western Refining, will stay on with Delek and its newly public Delek Logistics affiliate until the end of March to help Ginzburg's transition into the CFO chair at both companies. In a statement, Delek did not say what he plans to do afterward.

“Assi has demonstrated significant leadership capabilities and played an instrumental role in contributing to our company’s growth and strategic vision for nearly a decade. His intimate knowledge of our operations and financial processes makes him a natural choice to assume additional responsibilities as our Chief Financial Officer,” said Uzi Yemin, chairman and CEO of Delek US and general partner of Delek Logistics. “I’d also like to thank Mark Cox for his contribution to our company’s success over the last several years. We wish him much success in his future endeavors.”

Ginzburg, who was promoted to executive VP in 2009, was a financial advisor for Swary-Yohman Financial Consultants in Israel before joining Delek. Before that, he worked for consulting firm Itzhak Swary Ltd.