Trump’s new chief of staff is an unassuming figure in his brash inner circle. She’s also one of its most effective operators.

Dozens of people beamed alongside Donald Trump early Wednesday morning as he was elected America’s next president – including three generations of family, longtime friends, key advisers, his running mate, close political allies and Ultimate Fighting Championship CEO Dana White – but the architect of his remarkable political comeback was nearly invisible amid the celebratory throng.