Get to know the big bosses quietly reshaping how tech does business…

Q uestion: could you name the CEO of TikTok? Two billion people use his app, the most downloaded of the year, and yet you'd probably walk past Shou Zi Chew in the street without a second glance — and certainly without stop – ping for a selfie. And that's just the way he wants it. The mild-mannered, suit-wearing Singaporean cuts quite a different figure from most of the other maverick, space-racing CEOs of the big tech companies. Chew, 39, has no celebrity girlfriend, no movies have been made about him and he has posted just one solitary (and very boring)…