According to a letter in this file from Br. Patrick Hart, O.C.S.O. dated 2001, Fr. James Dodge (known as Frater Linus while with the Trappists) was a novice with Merton in 1941-1942. He later went to Mepkin Abbey in South Carolina after its founding in 1949. After staying at Mepkin a few years, he left to become a parish priest.
Fr. Linus was a monk of Gethsemani Abbey writing to Merton while away at studies in Rome.
Joseph Dolan was administrative assistant to Robert F. Kennedy while Kennedy was serving as a United States Senator from New York.
Pierre Dommerques was an Assistant Professor at the Sorbonne in the Institute of English and American Studies at the time of corresponding with Merton.
Fr. Felix Donahue was a Trappist monk of Gethsemani. At the time of correspondence, he was studying in Rome and trying to vote by proxy in the abbatial election to replace Dom James Fox. He would later join the Trappist foundation of Nossa Senhora do Novo Mundo in Brazil.
Ivanhoe Donaldson was working with the Student Nonviolent Coordinating Committee (SNCC) while corresponding with Merton. He worked alongside another Merton correspondent from this time, Marion Barry, who would later become mayor of Washington, D.C. He served as an advisor to Barry from the sixties to the eighties and was involved in Jesse Jackson's 1984 presidential campaign.
Professor Filippo Donini was Director of the Institute of Italian Culture at the Italian Embassy in New York.