Both The Idea Factory and Titan were excellent. Haven't read any of the others yet. I'd recommend reading The First Tycoon[0] before Titan, as chronologically i

Both The Idea Factory and Titan were excellent. Haven't read any of the others yet. I'd recommend reading The First Tycoon[0] before Titan, as chronologically it sets the stage very well for the world Rockefeller rose to power in. [0] http://www.goodreads.com/book/show/4839382-the-first-tycoon http://www.goodreads.com/book/show/4839382-the-first-tycoon