GlaxoSmithKline

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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

TheStreet Recommends

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

.