Doug Kass is at the Berkshire meeting in 2013 as the designated "bear" who has the job of challenging Buffett with questions at the annual meeting.
Kass has prepared for his assignment of asking tough questions by doing a great deal of investigative reporting. He believes he has come up with 6 to 8 questions that he believes are going to challenge Warren.
Kass is currently short Berkshire Hathaway. The last time he shorted Berkshire he made a 40% return.