John Ternus is Apple's head of hardware engineering.
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- John Ternus may be the frontrunner to become Apple CEO when Tim Cook steps down, Bloomberg reported.
- Ternus is the hardware engineering chief and has worked for Apple since 2001.
- Other names in the frame include chief operating officer Jeff Williams.
Tim Cook has been running Apple for more than 12 years, but he won't be CEO forever.
The 63-year-old is not expected to leave the role anytime soon...