The long lineage of powerful art dealers, begun by larger-than-life characters like Joseph Duveen and Leo Castelli, continues with today’s big players, like Jay Jopling of White Cube Gallery in London and Larry Gagosian (of pretty much everywhere else).  In the face of charges that the art market will finally outgrow an Old World way of doing things, today’s super-dealers have so far managed to maintain their stranglehold on the art market, and at least for the moment, continue to dictate how business is conducted.