GlaxoSmithKline plc (GSK) is a British multinational pharmaceutical, biologics, vaccines and consumer healthcare company which has its headquarters in Brentford, London. As of March 2014, it was the world's sixth-largest pharmaceutical company after Johnson & Johnson, Novartis, Hoffmann-La Roche, Pfizer, and Sanofi, measured by 2013 revenue. The company was established in 2000 by the merger of Glaxo Wellcome (formed from the acquisition of Wellcome plc by Glaxo Click Here To See Job Details And Apply