Plastic-container manufacturer Graham Packaging Co. L.P., of York, today named Mark S. Burgess as its new chief executive officer. Burgess has been the company's chief financial officer and chief operating officer.

His appointment is effective Jan. 1.

Warren D. Knowlton, CEO since 2006, is resigning, effective Dec. 31, but has agreed to continue with the company in the role of executive chairman, Graham said in a statement.

Burgess has been CFO since 2006 and COO since April. He previously served as president and CEO, as well as CFO, of Anchor Glass Container Corp., and led that company through a financial restructuring.

Graham produces more than 20 billion plastic containers annually at 83 plants in North America, Europe, and South America, and had sales of $2.49 billion in 2007. It is majority owned by the Blackstone Group of New York.