The Co-founder and CEO of taxi-hailing app Didi Chuxing, which bought Uber's China business earlier this month, 33-year-old Cheng Wei was once assistant to the head of a foot massage firm. After a year, Wei started working at Alibaba as a sales person and six years later in 2012, he co-founded Didi Chuxing. Wei's net worth is currently $1 billion.