I searched on OPEC as the current or former employer. None of these, as far as I can tell, are actually employed by OPEC. One is a liason from the Iran national oil ministry with a private profile, so the name isn't revealed in the search.
Without an account I can only see the first 5 of the ~300 hits. But Yasser Mufti looks like an OPEC employee to me, he's listed as the chairman of the board of governors. Maybe he's technically on Aramco's payroll, but I think that would be nitpicking since OPEC is funded by member companies.
http://www.linkedin.com/title/opec