WEB : www . gsk . com

Brentford , London serves as the headquarters of GlaxoSmithKline , a British pharmaceutical company that is a product of the merger between SmithKline Beecham and Glaxo Wellcome . The company also made headlines by appointing its first female CEO , Emma Walmsley , in March of 2017 . She currently stands at the helm of a $ 36.8bn revenue stream and a $ 3.4bn operating income . 33