Amit Singhal, former SVP of engineering and advisor to Travis Kalanick

Departure: February 27

Replacement: None

Google's former search chief came back out of retirement in January 2017 to join Uber as its new senior vice president of engineering. In the role, Singhal was in charge of overseeing engineering on Uber's marketplace and maps teams — two key departments that touch the core of Uber's business — and advising Uber's CEO, Travis Kalanick. However, Uber asked Singhal to resign a month after he joined the company after published reports disclosed that sexual-harassment allegations were made against him at his previous job, which he hadn't disclosed to Uber.