<Tr> <Th> Net worth </Th> <Td> US $785 million (2015) </Td> </Tr> <Tr> <Th_colspan="2"> Signature </Th> </Tr> <P> Timothy Donald Cook (born November 1, 1960) is an American business executive and industrial engineer . Cook is the Chief Executive Officer of Apple Inc., and previously served as the company's Chief Operating Officer under its founder Steve Jobs . </P> <P> Cook joined Apple in March 1998 as a senior vice president for worldwide operations, and then served as the Executive Vice President for worldwide sales and operations . He was made the Chief Executive on August 24, 2011, prior to Jobs' death in October of that year . During his tenure as the Chief Executive, he has advocated for the political reformation of international and domestic surveillance, cybersecurity, corporate taxation, American manufacturing, and environmental preservation . </P>

Who is the chief executive officer of apple