(Reuters) – James Murdoch, the co-chief operating officer of 21 Century Fox, is joining the board of digital advertising platform company True(X) Media, the company said on Thursday. Additionally, former Microsoft chief marketing officer Mich Mathews and former News Corp executive Jonathan Miller were also named directors rounding out the board to nine members. Joe Marchese, True(X) chief executive officer, said the experience of Murdoch, Mathews and Miller will help the company evolve in the areas of digital media and advertising. …