John Theriault, Apple's Vice President of Global Security, has left the company following the controversial iPhone 4S investigation in San Francisco, 9to5Mac is reporting. Theriault has been with Apple for over four years, having joined the company after serving as Chief Security Office at Pfizer. He is a former FBI agent and has been particularly active in fighting the growing problem of counterfeit Apple products in China. Apple has not commented on the report.