Title: LETTERS
Content:  LETTERS is an epistolary novel by the American writer John Barth, published in 1979. It consists of a series of letters in which Barth and the characters of his other books interact. In addition to the Author and Germaine Pitt (or 'Lady Amherst', unrelated to any of Barth's previous novels), the correspondents are Todd Andrews (from The Floating Opera), Jacob Horner (from The End of the Road), A.B. Cook (a descendant of Burlingame in The Sot-Weed Factor), Jerome Bray (associated with Giles Goat-Boy and Chimera) and Ambrose Mensch (from Lost in the Funhouse). The book is subtitled "An old time epistolary novel by seven fictitious drolls & dreamers each of which imagines himself factual." The structure is such that when the first character of each of the letters in the book are placed on a calendar according to their dates, and the individual months are turned sideways, they spell out the subtitle. In addition, the marked dates spell out the word "LETTERS."
Title: The Letters (novel)
Content:  The Letters is a novel by American writers Luanne Rice and Joseph Monninger. The novel was first printed in September 2008 in hardcover by Bantam Dell, a division of Random House, Inc.  The Letters is a fiction, romantic novel. The Letters tells a story of Sam and Hadley West who write each other a series of highly emotional letters during the course of their separation. The letters outline the course of their relationship before and after the death of their son in an airplane crash.
Title: The Letters of J. R. R. Tolkien
Content:  The Letters of J. R. R. Tolkien is a selection of J. R. R. Tolkien's letters published in 1981, edited by Tolkien's biographer Humphrey Carpenter assisted by Christopher Tolkien. The selection contains 354 letters, dating between October 1914, when Tolkien was an undergraduate at Oxford, and 29 August 1973, four days before his death.
Title: New Letters
Content:  Letters. Ray published work by Robert Bly, Cyrus Colter, Anselm Hollo, Joyce Carol Oates, Richard Hugo, Robert Peters and Josephine Jacobsen. In 1986, James McKinley became editor, and under his editorship the magazine published new work by Amiri Baraka, Thomas Berger, former President Jimmy Carter, Annie Dillard, Tess Gallagher, William Gass, Charles Simic, John Updike, and Miller Williams. Robert Stewart took over the post of editor-in-chief for New Letters, New Letters on the Air, and their affiliate, BkMk Press in September 2002. Since becoming editor, the magazine has published such writers as Brian Doyle, Quincy Troupe, Daniel Woodrell, Sherman Alexie, Sergio Troncoso, Marilyn Hacker, Maxine Kumin and Charlotte Holmes. New Letters won the National Magazine Award for the essay on May 1, 2008 at Lincoln Center in New York. The essay "I Am Joe's Prostate" by Thomas E. Kennedy appears in Volume 73, Issue 4.
Title: The Father Christmas Letters
Content:  The Father Christmas Letters, also known as Letters from Father Christmas, are a collection of letters written and illustrated by J. R. R. Tolkien between 1920 and 1943 for his children, from Father Christmas. They were released posthumously by the Tolkien estate on 2 September 1976, the 3rd anniversary of Tolkien's death. They were edited by Baillie Tolkien, second wife of his youngest son, Christopher. The book was warmly received by critics, and it has been suggested that elements of the stories inspired parts of Tolkien's The Lord of the Rings.
Title: Byron's letters
Content:  two volumes, though yet again in a bowdlerized form. In 1950 Peter Quennell produced a selection of the letters, called Byron: A Self-Portrait, of which 50 letters had not up to that point been published. In 1966 the American literary scholar Leslie A. Marchand, having written a magisterial biography of Byron, began work on editing his letters. The result, Byron's Letters and Journals, appeared in 11 volumes plus an index volume between 1973 and 1982, with a final supplementary volume in 1994. He was assisted in his work by the edition's publisher, John Murray VI, grandson of the earlier editor and great-great-grandson of Byron's 
Title: Robert Frost
Content: 1963. The Letters of Robert Frost to Louis Untermeyer (Holt, Rinehart & Winston; Cape, 1964). ; 1963. Robert Frost and John Bartlett: The Record of a Friendship, by Margaret Bartlett Anderson (Holt, Rinehart & Winston). ; 1964. Selected Letters of Robert Frost (Holt, Rinehart & Winston). ; 1972. Family Letters of Robert and Elinor Frost (State University of New York Press). ; 1981. Robert Frost and Sidney Cox: Forty Years of Friendship (University Press of New England). ; 2014. The Letters of Robert Frost, Volume 1, 1886–1920, edited by Donald Sheehy, Mark Richardson, and Robert Faggen. Belknap Press. ISBN: 978-0674057609. (811 pages; first volume, of five, of the scholarly edition of the poet's correspondence, including many previously unpublished letters.) ; 2016. The Letters of Robert Frost, Volume 2, 1920–1928, edited by Donald Sheehy, Mark Richardson, Robert Bernard Hass, and Henry Atmore. Belknap Press. ISBN: 978-0674726642. (848 pages; second volume of the series.) 
Title: Epistolae familiares
Content:  Petrarch begun a second collection of letters in 1361, also known as Letters of Old Age. It contains 128 letters written between 1361 and 1373. It is also broken down and sorted into volumes (18 books). The final letter, the first and only of the 18th book is his incomplete Letter to Posterity. Some English translations of this collection of letters that are out of copyright are available here A complete English translation is also available in two volumes from Italica Press, translated by Aldo S. Bernardo, formerly Distinguished Professor Emeritus of Italian and Comparative Literature, State University of New York at Binghamton.
Title: Letters to Family, Friends, and Editors
Content:  Letters to Family, Friends, and Editors is a book collecting some of Franz Kafka's letters from 1900 to 1924. The majority of the letters in the volume are addressed to Max Brod. Originally published in Germany in 1959 as Briefe 1902-1924, the collection was first published in English by Schocken Books in 1977. It was translated by Richard and Clara Winston.
Title: Letters to a Young Brother
Content:  Letters to a Young Brother is a book written by actor Hill Harper, published April 2006. Harper wrote the book to help young black males get through life and not make the same mistakes he made at a certain age. The book was inspired by Ranier Maria Rilke's Letters to a Young Poet.

Question: Who is the author of LETTERS?
Answer: John Barth.
John Simmons Barth.