Updated at 9:50 a.m. ET
The chief of Uber has resigned. Travis Kalanick, under pressure from his top investors, announced his departure Tuesday night. The move, which comes as a surprise to employees, plunges one of the largest private companies on Earth into an even bigger leadership vacuum.
A week ago, Kalanick said he was stepping away from his position as CEO temporarily, taking a leave of absence to mourn his mother, who recently died in a boating accident, and to work on his leadership, to grow into "Travis 2.0."