GlaxoSmithKline

(GSK) - Get Report

said George Morrow, co-president of U.S. pharmaceutical operations, resigned to take a position with another company, effective Jan. 19.

The British pharmaceutical giant said David Stout, 46, who headed

SmithKline Beecham's

North American pharmaceutical operations before it merged with

Glaxo Wellcome

, will assume Morrow's duties. Before joining SmithKline Beecham, Stout was president of

Schering Laboratories

.

GlaxoSmithKline's shares lately dipped 25 cents, or 0.5%, to $51.88 on the

New York Stock Exchange

.