As you may read on their web site, it's the world's largest particle physics laboratory located in Geneva, Switzerland, well it's partially in Geneva, partially in France. Paul is there right now. I recently got an email from him explaining what his project is at this time.
Here's a picture of Paul and an exerpt from his email, because there is just no way I could possibly paraphrase what it is he's saying.
"Enclosed is a picture of a colleague from Duke and me standing at the location where the two beams of protons will collide once the ATLAS detector and the accelerator are finished and running.Behind us is the barrel portion of the "inner detector", the outer part of which the Transition Radiation Tracker, the part I have been working on for 12 years now. The barrel will be moved towards the camera so that the center of it will be where we are standing. The two other pieces of the inner detector will slide in on either side of the barrel. We are standing the bore of a very large electromagnet that is used with the inner detector to measure the momentum of charged particles leaving the interaction point. The yellow thing we are standing on is just a platform that will be removed once the barrel is hooked up.
You can watch the webcams in the cavern at:http://atlaseye-webpub.web.cern.ch/atlaseye-webpub/web-sites/pages/UX15_webcams.htm
Eventhough I don't fully understand all this, it's still pretty cool, and is certainly a project that when completed will be quite satisfying I would imagine. Paul, we still think you're a spy. ;P