Steve Jobs, the mind behind the iPhone, iPad and other devices that turned Apple Inc. into one of the world's most powerful companies, has died. Jobs took a leave from his post in January after suffering from pancreatic cancer. The 56-year-old underwent an operation for cancer in 2004 and a liver transplant in 2009. Jobs formed Apple in 1976 marketed what was considered the world's first personal computer. Apple issued a statement saying "Apple has lost a visionary and creative genius, and the world has lost an amazing human being. Those of us who have been fortunate enough to know and work with Steve have lost a dear friend and an inspiring mentor."