What does a phantom technician do on a production set and why would a director need one? I just saw a video and in the credits is listed "phantom technician" ?
What are this person's duties, and why would a director need one on a production set?

Here is the video reference:
https://vimeo.com/23141142
This was shot with a Phantom HD camera. It's a special high-speed digital camera that can shoot at up to 1,500 fps (which is what the creators say they were shooting at). So he's likely the tech who setup this camera rig.