The rise and fall of Marissa Mayer, the once-beloved CEO of Yahoo now pursuing her own venture (YHOO)

· It's been more than two years since Marissa Mayer, the CEO of Yahoo, resigned after five years of trying to turn around the trajectory of the company's sinking ship.
· Mayer, 44, started out in Silicon Valley as Google's 20th employee. Now, she's pursuing her own venture, and is running a tech incubator called Lumi Labs.
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