Twain died on April 21, 1910, having survived his children Langdon, Susan and Jean as well as his wife, Olivia. In his lifetime, he became a distinguished member of the literati, and was honored by Yale, the University of Missouri, and Oxford with literary degrees. With his death, many volumes of his letters, articles, and fables were published, including: The Letters of Quintas Curtius Snodgrass (1946); Simon Wheeler, Detective (1963); The Works of Mark Twain: What is Man? and Other Philosophical Writings (1973); and Mark Twain's Notebooks and Journals (1975-79). Perhaps more than any other classic American writer, Mark Twain is seen as a phenomenal author, but also as a personality that defined an era.