Question: Who was the linguist who expanded on languages initially developed by the author of "The Hobbit"?

full_context: Document 1: David Salo: David I. Salo is a linguist who worked on the languages of J. R. R. Tolkien for the "Lord of the Rings" film trilogy, expanding the Elvish languages (particularly Sindarin) by building on vocabulary already known from published works, and defining some languages that previously had a very small published vocabulary. In 2003, he was a graduate student in linguistics at the University of Wisconsin–Madison.
Document 2: Johanna Nichols: Johanna Nichols is a professor emerita Linguist in the Department of Slavic Languages and Literatures at the University of California, Berkeley. Her research interests include the Slavic languages, the linguistic prehistory of northern Eurasia, language typology, ancient linguistic prehistory, and languages of the Caucasus, chiefly Chechen and Ingush. Nichols's best known work, "Linguistic Diversity in Space and Time", won the Linguistic Society of America's Leonard Bloomfield Book Award for 1994.
Document 3: Slavic vocabulary: The following list is a comparison of basic Proto-Slavic vocabulary and the corresponding reflexes in the modern languages, for assistance in understanding the discussion in Proto-Slavic and History of the Slavic languages. The word list is based on the Swadesh word list, developed by the linguist Morris Swadesh, a tool to study the evolution of languages via comparison, containing a set of 207 basic words which can be found in every language and are rarely borrowed. However, the words given as the modern versions are "not" necessarily the normal words with the given meaning in the various modern languages, but the words directly descended from the corresponding Proto-Slavic word (the "reflex"). The list here is given both in the orthography of each language, with accent marks added as necessary to aid in pronunciation and Proto-Slavic reconstruction. See below for a capsule summary of how to pronounce each language, as well as some discussion of the conventions used.
Document 4: J. R. R. Tolkien: John Ronald Reuel Tolkien, ( ; 3 January 1892 – 2 September 1973) was an English writer, poet, philologist, and university professor who is best known as the author of the classic high-fantasy works "The Hobbit", "The Lord of the Rings", and "The Silmarillion".
Document 5: Gandalf: Gandalf is a fictional character and one of the protagonists in J. R. R. Tolkien's novels "The Hobbit" and "The Lord of the Rings". He is a wizard, member of the "Istari" order, as well as leader of the Fellowship of the Ring and the army of the West. In "The Lord of the Rings", he is initially known as Gandalf the Grey, but returns from death as Gandalf the White.
Document 6: The Lord of the Rings: The Lord of the Rings is an epic high fantasy novel written by English author and scholar J. R. R. Tolkien. The story began as a sequel to Tolkien's 1937 fantasy novel "The Hobbit", but eventually developed into a much larger work. Written in stages between 1937 and 1949, "The Lord of the Rings" is one of the best-selling novels ever written, with over 150 million copies sold.
Document 7: Glorfindel: Glorfindel () is a fictional character in J.R.R. Tolkien's Middle-earth legendarium. He is introduced in various material relating to the First Age of Middle-earth, including "The Silmarillion". The name is also used for a character in "The Lord of the Rings", which takes place in Middle-earth's Third Age. In late writings, Tolkien works out how the two characters were one and the same, though this is not evident from the published versions of "The Silmarillion" and "The Lord of the Rings".
Document 8: Colin Manlove: Colin Nicholas Manlove (born 1942) is a literary critic with a particular interest in fantasy. "Modern Fantasy: Five Studies" (1975, published as by C. N. Manlove), which considers at length works by Charles Kingsley, George MacDonald, C. S. Lewis, J. R. R. Tolkien and Mervyn Peake, was written at a time when "no serious study of the subject [of fantasy literature] has appeared". In it he posits a definition of fantasy as:
Document 9: Elamo-Dravidian languages: The Elamo-Dravidian language family is a hypothesised language family that links the Dravidian languages of India to the extinct Elamite language of ancient Elam (present-day southwestern Iran). Linguist David McAlpin has been a chief proponent of the Elamo-Dravidian hypothesis. According to McAlpin, the long-extinct Harappan language (the language or languages of the Indus Valley Civilization) might also have been part of this family. The hypothesis has gained attention in academic circles, but has been also been subject to serious criticism by other linguists, and remains only one of several scenarios for the origins of the Dravidian languages.
Document 10: Salikoko Mufwene: Salikoko Mufwene is a linguist born in Mbaya-Lareme in the Democratic Republic of the Congo. He is the Frank J. McLoraine Distinguished Service Professor of linguistics at the University of Chicago. He has worked extensively on the development of creole languages, especially Gullah and Jamaican Creole, on the morphosyntax of Bantu languages, especially Kituba, Lingala, and Kiyansi (which he speaks natively), and on African American Vernacular English. He has also published several articles and chapters about language evolution. Mufwene received his Ph.D. in linguistics from the University of Chicago in 1979.
Document 11: Adaptations of The Lord of the Rings: "The Lord of the Rings", an epic high fantasy novel by the British author J. R. R. Tolkien, set in his fictional world of Middle-earth, has been adapted several times.
Document 12: The Lord of the Rings: The Fellowship of the Ring: The Lord of the Rings: The Fellowship of the Ring is a 2001 New Zealand-American epic high fantasy adventure film directed by Peter Jackson based on the first volume of J. R. R. Tolkien's "The Lord of the Rings" (1954–1955). It is the first installment in "The Lord of the Rings series", and was followed by "" (2002) and "" (2003), based on the second and third volumes of "The Lord of the Rings".
Document 13: Seslisözlük: Sesli Sozluk is a multilingual online dictionary, primarily English to Turkish and Turkish to English. As of February 2009, it has a rank of 6 among all online dictionaries worldwide. German, Italian, French, Spanish, Greek, Russian, Danish, Dutch, Polish and Portuguese translations are also provided. The online dictionary also can be used in PDAs, SmartPhones, any phone supporting a web browser.
Document 14: James Kari: James Kari is a linguist and Professor Emeritus with the Alaska Native Language Center at the University of Alaska Fairbanks (UAF) specializing in the Dene or Athabascan languages of Alaska. In the past forty years he has done extensive linguistic work in many Dene languages including Ahtna, Dena'ina, Koyukon, Deg Hit'an, Holikachuk, Lower Tanana, Middle Tanana, Tanacross, Upper Tanana, and Babine-Witsuwit'en. He was on the faculty of UAF from 1973 until his retirement in 1997. He continues to work on numerous Alaska Native language projects. He is the author or editor of over 200 publications, including more than 3000 pages of bilingual texts in seven Dene languages. He is the most prolific contributor to the Alaska Native Language Archive (with more than 950 entries). His special interest is Dene ethnogeography, and he has compiled or documented more than 12,000 place names in fourteen Alaska or Canadian or Southwest Dene languages. He worked with Dena'ina writer and ethnographer Peter Kalifornsky on a 1991 compilation of his creative writings. In 2008 he was the organizer of the Dene–Yeniseian Symposium in Alaska, and co-editor of the volume "The Dene–Yeniseian Connection" published in 2010. In 2009 Alaska governor Sarah Palin selected Kari to receive the Governor's Award for the Humanities. In March 2013 Kari received the Professional Achievement Award at the 40th annual meeting of the Alaska Anthropological Association.
Document 15: Elrond: Elrond Half-elven is a fictional character in J. R. R. Tolkien's Middle-earth legendarium. He is introduced in "The Hobbit", and plays a supporting role in "The Lord of the Rings" and "The Silmarillion".
ground_truth: David I. Salo