Sheryl Sandberg Chief Operating Officer of Facebook.
When Mark Zuckerberg said he hired her because “she has just about the most relevant industry experience for Facebook.
She had expected to be at the company only for five years rather than the 14 she has served.
Ms Sandberg, said, “It is time for me to write the next chapter of my life.”
“Sitting by Mark's side has been an honour and privilege of a lifetime,” she added.