Documentary portraits don't stand on their own. They are made while doing a report or documentary on your business or during a day in your private life. Only a full pro photojournalist can blend into the surroundings and shoot things as they happen.
A factory, a theatre piece or an official visit of a high guest. Within the event he will make professional portraits. Portraits that can be used separate from the story. Portraits that stand on their own, while they are a combination of available light, flexibility and improvisation of the photographer
Hire a photographer that has only one goal: Delivering you some great footage.