Adam Nussdorf is one of the professors at the Lost University. He is on sabbatical and will return to his office on September 22nd.
His number was scrawled on the back of a flyer for the Lost University (handed out at comic-con) along with a note that said that he could possibly need a TA. Those who called the number got a prerecorded message stating the above.
It was announced on the university's news page that he was recently promoted to the head of the Department of Media Studies and Online Education. The position was created to make sure all the classes are designed to educate and enhance viewer appreciation of LOST in preparation of season 6.