U.N. Secretary General Kofi Annan has begun a major shake-up of the senior management by announcing that Mark Malloch Brown would take over as his Chief of Staff. Brown, a 51-year-old Briton, is a high profile head of the United Nations Development Agency and replaces 70-year-old Iqbal Riza of Pakistan. He would take over on January 19. Riza, who was Annan's close adviser, is officially stated to have asked for ...