London, United Kingdom: G4S, the world's largest security group, is replacing its chief executive after a series of failures including a staffing fiasco at the 2012 London Olympics culminated in a recent profit warning.
Nick Buckles, 52, who has led the company for eight years, will be succeeded at the end of the month by Chief Financial Officer Ashley Almanza, a former executive of oil and gas firm BG Group who joined in March.