Choi had a stint as chief design officer and established Samsung's chip business in Europe in the 1980s. He is best known as a marketing expert, however, and is credited with having steered Samsung past Sony (SNE) to become the world's No. 1 TV brand in 2006. Choi took over the running of Samsung's mobile phone business in January 2007. By September 2008, the company's global market share stood at 17.1%—second only to Nokia and up from 14.4% in 2007.