There is nothing special about that pic. No special set up, no special camera used, no way out there technique used. That is simply a snap shot using a flash. You can see the flash head of the camera he is holding throwing a shadow, and his head throwing a shadow. The reason the background to the right of his head is dark is the wall is going away at an angle.
Now if you want to take a picture of someone or something lit while a background is dark you can go at it a couple ways.
Have the subject a good distance away from a darkend background.
Or using light modifier so that the flash or light source only covers the subject (barn doors, snoots, cardboard, what ever to limit stray light).
Maybe a combination of the two, some distance / some light modifiers. Several ways to do it.