He will report to Mark Rabe, the managing director and vice president of sales. Brown will be responsible for the company's display, mobile, sponsorship, search technology and relationships. He was previously the head of trading for two years.
Last month, Yahoo's revenues declined 4 per cent year-on-year in the fourth quarter and dipped 10 per cent to £4.02bn for the full year. This is despite a launch of a high-profile ad campaign in September to raise brand awareness among consumers and advertisers.