Working with a billionaire business icon at the top of their game can have its challenges, but the rewards are often breathtaking: think enormous bonuses, freebie holidays, and even designer shopping sprees.

How do we know? Because close colleagues in the inner circles of the world's highest-flyers have revealed their leadership styles, professional habits, and more.

Read on to get the inside scoop on what it's really like to work for 14 of the world's most successful billionaires.

All dollar amounts in US dollars