Mark K. Updegrove is the author of four books on the presidency, including Indomitable Will: LBJ in the Presidency. The inaugural CEO of the National Medal of Honor Museum and the former director of the LBJ Presidential Library, Updegrove is a contributor to ABC News and Good Morning America, and has written for the Daily Beast, National Geographic, the New York Times, Parade, Politico, Texas Monthly, and Time. He lives in Austin, Texas.