Book Three of George Santayana's letters covers a period of intense intellectual activity in Santayana's life, and the correspondence reflects the establishment of his mature philosophy. Santayana becomes more permanently established in Italy, but continues to travel in France, Spain, and England. The year 1927 marks the beginning of his long friendship with Daniel Cory, who became his literary secretary and eventually his literary executor. Also, with the death of Santayana's half-brother Robert, George Sturgis, Robert's son, becomes an important part of Santayana's life and letters as his financial manager. Santayana continues to write to his sister Susana, as well as to numerous friends and fellow philosophers, including Bernard Berenson, Robert Seymour Bridges, Curt John Ducasse, John Erskine, Horace Meyer Kaller, Lewis Mumford, George Herbert Palmer, John Francis Stanley Russell, Herbert Wallace Schneider, Charles Augustus Strong, Paul Weiss, and Harry Austryn Wolfson. Other correspondents include Wendell T. Bush, Alys Gregory, Marianne Moore, John Middleton Murray, and Frederick J. E. Woodbridge.
Philosopher, poet, literary and cultural critic, George Santayana is a principal figure in Classical American Philosophy. His naturalism and emphasis on creative imagination were harbingers of important intellectual turns on both sides of the Atlantic. He was a naturalist before naturalism grew popular; he appreciated multiple perfections before multiculturalism became an issue; he thought of philosophy as literature before it became a theme in American and European scholarly circles; and he managed to naturalize Platonism, update Aristotle, fight off idealisms, and provide a striking and sensitive account of the spiritual life without being a religious believer. His Hispanic heritage, shaded by his sense of being an outsider in America, captures many qualities of American life missed by insiders, and presents views equal to Tocqueville in quality and importance. Beyond philosophy, only Emerson may match his literary production. As a public figure, he appeared on the front cover of Time (3 February 1936), and his autobiography (Persons and Places, 1944) and only novel (The Last Puritan, 1936) were the best-selling books in the United States as Book-of-the-Month Club selections. The novel was nominated for a Pulitzer Prize, and Edmund Wilson ranked Persons and Places among the few first-rate autobiographies, comparing it favorably to Yeats's memoirs, The Education of Henry Adams, and Proust's Remembrance of Things Past. Remarkably, Santayana achieved this stature in American thought without being an American citizen. He proudly retained his Spanish citizenship throughout his life. Yet, as he readily admitted, it is as an American that his philosophical and literary corpuses are to be judged. Using contemporary classifications, Santayana is the first and foremost Hispanic-American philosopher.