champion of change

noun [C]

Definition

› (also change champion) HR, MANAGEMENT, WORKPLACE a leader or manager who is in charge of a change programme: Champions of change must have the ability to imagine corporations reorganized in completely new ways.

› a person who is very interested in new or different ways of doing something, and is determined to make changes happen: The new CEO is being heralded as a champion of change.

(Definition of champion of change noun from the Cambridge Business English Dictionary © Cambridge University Press)