The Coca-Cola Co. announced several management changes and the resignation of its North American marketing boss as it continues revamping its executive ranks under chief executive Neville Isdell.

In a memo to employees, Donald Knauss, the head of Coke's North America unit, said Javier Benito was resigning to pursue other interests after 10 years at the company. For the past year, Benito has been president of U.S. retail and chief marketing officer for Coca-Cola North America.

Knauss said the company is splitting Benito's job in two. As such, the world's largest beverage maker is separating its U.S. retail division and its North America marketing unit.

Melody Justice, who previously worked in strategy and planning, was named president of the U.S. retail division, and John Hackett, who previously was general manager of Coca-Cola North America's hydration business unit, was named senior vice president of marketing for the North America unit. Both will report to Knauss.

"We succeed when we have an organization with clear lines of accountability and a structure properly aligned with our North American bottlers and customers," Knauss said.