The background should be lit brightly with no light on the front of the person is the obvious technique. Why not make it interesting though. “Slash” the wall with light right behind the person’s head — perhaps in a color, perhaps with texture. Backlight the person’s shoulders but not their head at all. It’ll define their 3 dimensionality.
Put a black srim or nylon net between the person’s face and the camera and splash some textural light on the front of the scrim, but from a low angle. The more light you have on the front of the scrim the less transparent it will be, eventually rendering the person behind it “invisible”.
DS