This is the information I have for you about GlaxoSmithKline CEO:
United States: J.P. Garnier, Chief Executive Officer
GlaxoSmithKline 5 Moore Drive P.O. Box 13398 Research Triangle Park NC, 27709 Phone: 1-888-825-5249
Most likely you will not get directly to Mr. Garnier, if you are trying to contact him, but the information requested is listed above.