John Ternus takes the top job at Apple, the first engineer in the seat since Jobs, as Cook signs off with a nod to the founder.

After 15 years, Tim Cook hands Apple to John Ternus - here's how he turned a $350B company into a $4.6T juggernaut.

After 14 years leading Apple to a $3 trillion valuation, Tim Cook signs off with a heartfelt note. What does the transition mean for investors and the tech industry?