He was chief historical researcher on Harold Evans’s illustrated history of the United States, The American Century.[citation needed]. In addition, Baker is the author of America: The Story of Us (2010), the companion book to the History Channel series of that same name, and he wrote the new final chapter for the reissue of Baseball, the companion book to Ken Burns' 10-part film, Baseball, which has aired on public television. In the fall of 2014, Baker published a historical novel (with Houghton Mifflin Harcourt) called The Big Crowd. In the New York Times Book Review, Scott Turow wrote: "Best of all, the novel delivers on what the title promises....I've read few other novels that portray, in such a nuanced way, the temptations of power, the complex division of control in a great metropolis and the perils of political deal-making." In addition, in that same season, Baker wrote an as-told-to book with Yankees slugger Reggie Jackson called Becoming Mr. October (Doubleday). Wikipedia.