As its title indicates, Jaron Lanier’s new tech manifesto asks, “Who owns the future?” But for many of those who will be captivated by Mr. Lanier’s daringly original insights, another question comes first: Who is Jaron Lanier? He is a mega-wizard in futurist circles. He is the father of virtual reality in the gaudy, reputation-burnishing way that Michael Jackson was the king of pop. Mr. Lanier wou