There’s a new kind of energy at Kensington Publishing Corp. And it has been building since Michaela Hamilton ascended the elevator at 850 Third Avenue two years ago. After a 25-year career in book publishing (including 10 years as editor-in-chief of NAL) and a few years at freelance editing, Michaela got the offer from Kensington founder and CEO Walter Zacharius to become the company’s new editor-in-chief. Now this ball of fire has the freedom to realize a vision she and Walter share.