Today, Cook still calls Jobs irreplaceable.
"To me, Steve's not replaceable — by anyone," Cook told Jena McGregor of The Washington Post in a recent interview. "He was an original of a species."
Jobs, who was obsessed with product details and marketing, has been credited with transforming Apple and changing several industries, including technology, retail and entertainment. He was also a driven and sometimes ruthless manager.
Ousted from his own company in 1985, Jobs maintained an aggressive management style when he returned to Apple a decade later to help turn things around. He arguably had to be an aggressive leader — after all, Apple was on the verge of bankruptcy and a major underdog at the time.
As one former Apple employee put it: "Steve was a wartime CEO."
His style, while controversial, worked. Apple went from underdog status to the most valuable company in the world.