Tim Cook, Apple
It may seem odd that the chief executive of the largest and most popular technology company in the world would be in jeopardy. But Cook has come under fire from Wall Street recently as Apple's stock price has taken a dramatic nosedive, plunging from more than $700 in September to just over $400 today. In addition, Apple's golden goose -- the iPhone -- has seen its growth slow in recent quarters as competition from Samsung and other smartphone makers has increased. Meanwhile, Apple fans and investors are getting anxious about new product announcements, wondering what the next big thing from Apple will be.