Tim Cook is stepping down as CEO of Apple: Here’s a look at his 15-year legacy, from new products and services to China expansion

Cook, who joined Apple in 1998, succeeded Steve Jobs as CEO in 2011 and went on to transform Apple into a $4 trillion powerhouse. 

​Cook, who joined Apple in 1998, succeeded Steve Jobs as CEO in 2011 and went on to transform Apple into a $4 trillion powerhouse.