Br. John Lyons was a Salvatorian writing first from Mount St. Paul College in Waukesha, Wisconsin, and later from New Holstein, Wisconsin.
Andrew Nelson Lytle was an author of essays, novels and short stories, a professor of history and creative writing, and an editor. Lytle writes to Merton as editor of «The Sewanee Review», a quarterly published by the University of the South in Sewanee, Tennessee. Merton became a regular contributor to this publication. In addition, Lytle often sent books of interest to Merton.
Diosdado Macapagal was President of the Philippines at the time of correspondence.
Alasdair Alpin MacGregor was a writer, photographer and poet, born in Scotland. At the time of correspondence with Merton, he was writing a biography of the artist Percyval Tudor-Hart.
Robert MacGregor was writing on behalf of New Directions Publishing. He was Vice President of New Directions during much of this time. He died in 1974 at the age of 63.
Fr. Thomas MacMaster was a Trappist priest from the Abbey of Notre-Dame-des-Prairies in St. Norbert, Manitoba, Canada.
Sr. Mary Maddaleva was a Poor Clare sister from Evansville, Indiana.
Sr. Mary Madeleva, born Mary Evaline Wolff, was a Sister of the Holy Cross who served as long time president of Saint Mary's College in Notre Dame, Indiana. She is also known as a poet and literary critic. She shared with Merton a love of medieval Christian mysticism. In his letter, Merton specifically praises Julian of Norwich. By the first extant letter in 1953, Merton and Sr. Madeleva had seemed to have already written letters to each other. (Source: "Madeleva, Mary." World Authors." 1996. Wilson Biographies Plus. Online. H.W. Wilson. Bellarmine University Library, Louisville, KY. 2 Nov. 2005. ‹http://vnweb.hwwilsonweb.com›.)
Herbert D. Magidson writes from Beverly Hills, California, on behalf of Individuals against the Crime of Silence, an organization opposed to the Vietnam War.
James Edmund Magner Jr. was a poet and professor at John Carroll University in Ohio. He grew up in New York. In his early years, he helped underprivileged children, taught boxing and worked at a newspaper before serving in the United States Infantry from 1948-1951. After suffering a wounded knee in the Korean War, he returned to the United States and spent time at monasteries in New York, Pennsylvania, and Connecticut. He was a Passionist seminarian for five years before leaving to earning a degree at the University of Pittsburgh. He continued his graduate work at Pittsburgh, earning his doctorate in 1966. He has published eight volumes of poetry. (Source: "James Magner Jr. Collection." Website of the Ohio University Library Archives and Special Collections. Accessed 3 Nov. 2005. ‹http://www.library.ohiou.edu/libinfo/depts/archives/mss/mss062.htm›.)
Una Maguire was a psychologist writing to thank Merton for his article "Notes on Love" that appeared in the Autumn 1967 issue of «Frontiers».
T. K. Mahadevan was an editor from «Gandhi Marg», a quarterly journal of Gandhian thought in New Delhi, India. He asks Merton to contribute to the journal.
Fr. Henry Mahaney was a Franciscan priest from St. Pius X Church of the Capuchin Fathers in Middletown, Connecticut.
Halina Majchrzakówna writes from Poland.
Carolyn W. Mallison writes from Watertown, New York.
Br. Simeon Malone was a lay brother at Gethsemani Abbey. He was originally from Wichita, Kansas, and entered Gethsemani in 1957. Br. Simeon was a secretary to Dom James Fox at Gethsemani Abbey in the 1960's.
Bishop Charles G. Maloney was Auxiliary Bishop of the Archdiocese of Louisville, Kentucky, at the time of writing to Merton.
Fr. George A. Maloney is a Jesuit priest of the Russian Byzantine Rite and the founder of the John XXIII Center for Eastern Christian Studies at Fordham University in New York, where he taught patristics and Eastern theology. He writes on behalf of «Diakonia», a quarterly journal that promoted dialogue between Catholic and Orthodox Christians, asking that Merton submit something for publication.
Fr. Eugene H. Maly writes for the periodical «The Bible Today», a publication of Mt. St. Mary's Seminary in Norwood, Ohio.
Archimandrite Laurence Mancuso founded the Monks of New Skete in Cambridge, New York, in 1966. In his first letter to Merton in 1961, he was a Franciscan priest in the Byzantine-Slavonic Rite, living in New Canaan, Connecticut. After founding New Skete, he joined the Orthodox Church in America.
Bill Manning writes from Hopkins, Minnesota.
Josefina Manresa writes on behalf of Aguilar publishers in Madrid, Spain.
Manuel Mantero was a poet writing from Madrid, Spain.
Fr. Marcellus was a Trappist monk of Holy Spirit Abbey in Conyers, Georgia.
Adria Marconi was a student from Milan, Italy, studying foreign language and graduating with a degree in English and American literature.
Gladys Marcus was the sister of Merton's close friend Bob Lax. Merton got to know her and her husband, Benji Marcus, in the summer of 1938. Merton was having some difficulty in getting in touch with her brother Robert and asks her for assistance in 1967. She writes back informing him that he will be coming back to the United States. In addition, she informs Merton of the death of her husband.
Sr. Margaret Mary was a Benedictine nun of St. John's McNamara School of Nursing in Rapid City, South Dakota.
Sr. Maria da Concricão da Virginem Dolorosa writes from the Carmelite convent of St. Teresa in Rio de Janeiro, Brazil.
Sr. Maria de los Angeles was a nun of the Carmelite Monastery of Cristo Rey in San Francisco, California.
Merton writes to Adrienne Mariani of Glen Ridge, New Jersey.
Abbess Marie of the Assumption Marie of the Assumption was of the Portiuncula Monastery of the Holy Trinity, Poor Clares-Colettines, in Mwanza, Tanzania. She writes to the Mother Abbess of the Monastery of Saint Clare in Lowell, Massachusetts (who likely forwarded her letter to Merton).
Sr. Marie of the Eucharist was a Carmelite nun.
Sr. Marie Pius writes from the Monastery of Saint Clare in New Orleans, Louisiana. She was the first African-American admitted to the Poor Clares in the United States. She was suffering from a terminal illness at the time of writing to Merton.
Sr. Marie-Aurelie is writing from the Monastery of the Precious Blood in Hamilton, Ontario. According to Sr. Marie-Aurelie's first letter, the Sisters Adorers of the Precious Blood were the first contemplative order in Canada, founded in 1861 in St. Hyacinth, Quebec.
Br. Marie-Bernard was a Trappist monk, possibly of Gethsemani Abbey.
Sr. Marie-Bernarde was a Dominican sister of the Sacred Heart Dominican College in Houston, Texas.
Sr. Marie-Pascal was a Daughter of Mary serving at the Ecole Notre Dame du Perpetuel Secours in Port au Prince, Haiti.
Fr. Richard Marimon writes from New York, but undersigns that he is a Spanish priest from the Diocese of Ponce.
Fr. Francis Marino was a Marianist priest from Immaculate Conception Church in Westerly, Rhode Island. He suggests that Merton write to Sr. Immaculate Heart of White Plains, New York, considering their plans for a new contemplative order with a goal of liturgical renewal, called the "Handmaids of the Blessed Trinity".