Politics: The Poet as Realist, examined Voltaire as a politician and how his politics influenced the ideas that Voltaire championed in his writings. Accompanying Voltaire's Politics was Gay's collection of essays, The Party of Humanity: Essays in the French Enlightenment (1964). Gay followed the success of Voltaire's Politics with a wider history of the Enlightenment, The Enlightenment: An Interpretation (1966, 1969, 1973), whose first volume won the 1967 U.S. National Book Award in History and Biography. Annelien de Dijn argues that Gay, in The Enlightenment, first formulated the interpretation that the Enlightenment brought political modernization to the West, in terms of introducing democratic values and institutions and the creation of modern, liberal democracies. While the thesis has many critics, it has been widely accepted by Anglophone scholars and has been reinforced by the large-scale studies by Robert Darnton, Roy Porter, and most recently by Jonathan Israel. His 1968 book, Weimar Culture, was a study on the cultural history of the Weimar Republic. Gay was also a champion of psychohistory and an admirer of Sigmund Freud. Starting in 1978 with Freud, Jews and Other Germans, an examination of the impact of Freudian ideas on German culture, his writing demonstrated an increasing interest in psychology. Many of his works focused on the social impact of psychoanalysis. For example, in A Godless Jew: Freud, Atheism, and the Making of Psychoanalysis, he linked Freud's atheism to his development of psychoanalysis as a field. He wrote history books applying Freud's theories to history, such as The Bourgeois Experience: From Victoria to Freud. He also edited a collection of Freud's writings called The Freud Reader. His writing was generally favorable, though occasionally critical, toward Freud's school of thought. Gay's 2007 book Modernism: The Lure of Heresy explores the modernist movement in the arts from the 1840s to the 1960s, from its beginnings in Paris to its spread to Berlin and New York City, ending with its death in the pop art of the 1960s. Personal life Gay married Ruth Slotkin (1922-2006) in 1959 and had three stepdaughters. Death Gay died at his home in Manhattan on May 12, 2015, at the age of 91. Awards and recognition Gay received numerous awards for his scholarship, including the National Book Award in History and Biography for The Rise of Modern Paganism (1967), the first volume of The Enlightenment; the first Amsterdam Prize for Historical Science from The Hague,