Editorial Director of Digital Book World Jeremy Greenfield to present “The More Empowered Author” at ECPA Leadership Summit, April 28-30, Colorado Springs  With self-publishing a legitimate route for established and aspiring authors alike, authors have more power than ever in the publishing marketplace. As a result, publishers, more than ever before, need to be attentive to the needs of their authors, lest they decide they’re better off without a publisher. Digital Book World and Writer’s Digest have surveyed 9,000 authors…