As an independent historian of American Conservatism, Dr. Hash has published a lot of books, including the very famous The Conservative Intellectual Movement in America Since 1945 (1976; 3rd ed. 2006), and The Life of Herbert Hoover.

Among others, Dr. Nash examined the intellectual development and current configuration of modern American conservatism: a coalition with many diverse tendencies. Since the end of the Cold War in the 1990s, the conservative coalition has undergone many challenges. Dr. Nash analyzed these growing challenges, including the recent "volcanic eruption" of populism and the remarkable rise of Donald Trump.