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Steve Jobs, Apple

Tech entrepreneur Steve Jobs had a tumultuous history with Apple, which he co-founded in 1976 and took public in 1980.

Jobs avoided the CEO position in the early years but was renowned for working hands-on with product development, where his demand for perfection would become part of his legacy. In 1985, the board effectively fired him, saying that Jobs was stressing out Apple's workforce.

Though disillusioned initially, the young multimillionaire went on to start NeXT and Pixar Studios. He became CEO of Pixar in 1995, the same year box-office smash "Toy Story" was released. (The Walt Disney Co. bought Pixar in 2006 at a valuation of $7.4 billion.)

In 1997, the wunderkind was asked to rejoin the now-struggling Apple. He accepted the interim CEO position and oversaw the company's rebound, revamping the product line and re-energizing the investor base.

In 2004 and 2009, the seemingly invincible Jobs struggled with recurring pancreatic cancer and underwent a liver transplant in 2009. He relinquished the CEO post to Tim Cook in August 2011 and died two months later.

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