Although noted historian and Pulitzer Prize-winning author Doris Kearns Goodwin has spent countless hours researching and writing about presidents Abraham Lincoln, Theodore Roosevelt, Franklin Roosevelt and Lyndon Johnson, she learned something new about each of the men as she wrote her newest book, “Leadership: In Turbulent Times” (Simon & Schuster). Doris Kearns Goodwin says someone able to consider radically different opinions while shaping policy — such as Abraham Lincoln — is what’s needed in the Oval Office. Each man – and the challenges they faced – were different, sometimes vastly so, but they shared common traits: resilience, a moral compass, and the ambition to serve the greater good.