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The project manager
Project Manager as a face but whole team is the key of success of project
since you are asking about who and not what,i believe that if the project is customer focused or oriented or even innitiated the key driver is is the customer, if it is a normal project i believe it is the project manager.
Once the PM is assigned, he/she is the key driver of the project becuase he/she is accountable for the success of the project once launched. Before that, It will be the customer because he/she is the approving party for any progress.
I agree its the PM who contols it but only when it starts, aren't we forgetting the BOSS who initiated it, if he stops or delays in any matter then what ?
The Project Manager. However the sponsor plays a key role in supporting the PM 's decisions.