Denis O'Brien is one of Ireland's leading entrepreneurs with investments across several sectors including international telecoms, radio, media, property, aircraft leasing, golf and online recruitment. He's the chairman and principal shareholder of Digicel Group, one of fastest growing cellular companies in the world, and majority shareholder of China HR, one of China's largest online recruitment companies. He is also Chairman and co-founder of Frontline, the International Foundation for the Protection of Human Rights Defenders.