A student is researching Göbekli Tepe, an ancient archaeological site. The student has taken the following notes:
* Göbekli Tepe is an archaeological site located in southeastern Turkey.
* The site features massive T-shaped stone pillars dating to the millennium BCE.
* It was first surveyed in by researchers from Turkey and the United States.
* Detailed excavations at the site began in .
* These excavations were directed by German archaeologist Klaus Schmidt.
* Schmidt interpreted the site as a Neolithic sanctuary rather than a residential settlement.
The student wants to write a sentence that emphasizes when the detailed excavations at Göbekli Tepe began and who directed them. Based on the notes, what year and which archaeologist's name should be filled in the blanks to achieve this goal?