David Nasaw is an American author, biographer and historian who specializes in the cultural and social history of early 20th Century America. He recently retired from the Graduate Center of the City University of New York, where he was the Arthur M. Schlesinger, Jr. Professor of History.
He has written the definitive biographies of William Randolph Hearst and Joseph P. Kennedy, and most recently, “The Last Million: Europe’s Displaced Persons from World War to Cold War”
(https://www.penguinrandomhouse.com/books/318732/the-last-million-by-david-nasaw/). He holds a PhD from Columbia University.