The thing that Is important, is he's a "Sayyed," which is one who claims to be a descendant of imam ali (look at their turbans... the black turban is supposed to signify this). Anyways, this makes him an Arab.
Sorry, clarification.. I went to look it up to check what I just posted and black turbans in shia islam can also signify scholars. Hes still a "sayyed" tho!