Ehret's historical books emphasize early African history. In
An African Classical Age (1998) he argued for a conception of the period from 1000 BC to 400 AD in
East Africa as a "classical age" during which a variety of major technologies and social structures first took shape. His Civilizations of Africa: A History to 1800 (2002), brings together the whole of African history from the close of the last ice age down to the end of the eighteenth century. With the archaeologist Merrick Posnansky, he also edited
The Archaeological and Linguistic Reconstruction of African History (1982), at that time a state-of-the-field survey of the correlation of linguistic and archaeological findings in the different major regions of the continent. The historian Esperanza Brizuela-Garcia, in her review of
The Civilizations of Africa for the
African Studies Review, calls this book "challenging and innovative" for presenting "the early history of Africa within the context of wide historical processes such as the development of agriculture, the emergence of metalwork, and the evolution of trade…. It gives these themes a thorough and masterful treatment…. By looking at broad themes of the history of human experience, Ehret is able to explain what makes Africa unique and what makes it comparable to other continents.” She concludes: "The most important achievement of Ehret’s book is that finally the early history of the continent is taken seriously and is presented in detail and form that do justice to its complexity and depth. One hopes that Christopher Ehret has initiated a new trend in the writing of African history textbooks, one that challenges previously accepted chronologies and ideas and presents us with an interpretation that connects social, economic, political, and cultural history.” Scott MacEachern's review of the same book for the
Journal of Africa History adds an archaeologist's perspective: "The book is well written and comprehensive and abundantly illustrates the richness and complexity of African societies over many thousands of years. More discussion of methodologies and data compatibility, and a more complete reference list, would have been useful. It will make a fine introductory text for courses in African history, especially if supplemented by books and papers that reflect other research methods and their results.” In later years Ehret carried his work in several new directions, including the history and evolution of early human kinship systems. He also was interested in applying the methods of historical reconstruction from linguistic evidence to issues in anthropological theory and in world history, and he collaborated with geneticists in seeking to correlate linguistic with genetic findings (e.g., Sarah A. Tishkoff, Floyd A. Reed, F. R. Friedlaender, Christopher Ehret, Alessia Ranciaro, et al., "The Genetic Structure and History of Africans and African Americans", Science 324, 22 May 2009). He was also engaged in developing mathematical tools for dating linguistic history (e.g., Andrew Kitchen, Christopher Ehret, Shiferew Assefa, and Connie Mulligan, "Bayesian phylogenetic analysis of
Semitic languages identifies an Early Bronze Age origin of Semitic in the Near East," Proceedings of the Royal Society B: Biological Sciences, July 2009). Ehret died on 25 March 2025.
An African Classical Age In reviewing
An African Classical Age for the
Annals of the American Academy of Political and Social Science,
Ronald Atkinson calls it "not easy or light reading", but concludes that "the result is a remarkably rich, evocative social and cultural history…” and that it "will itself become a classic and shape future scholarship in early African history for many years to come.” The late Kennell Jackson of
Stanford, writing in
The Historian, says that "by the book’s midpoint, the immensity of his synthesis becomes apparent, as well as Ehret’s achievement as a historical conceptualizer. He repeatedly challenges formulaic ideas about causality, linearity as a model of change, and the cultural factors affecting innovation…. Ehret has written a fabulous African history book, furthering a genre far from the seemingly ubiquitous slavery studies and trendy colonial social history.” Peter Robertshaw, in the
Journal of the Royal Anthropological Institute, offers a more measured conclusion: "Ehret has produced a remarkably coherent and detailed history which should spur further research.” Mitchell also expressed a hope that critical analysis of the text may help “bring archaeological and historical linguistic perspectives into a closer dialogue.” Moreover, the archaeologist
Graham Connah described the work as “a rich source of potential research objectives, because it makes repeated predictions of areas and subjects that would repay archaeological investigation.” According to Connah, “there can be no doubt that this is an important book and that it is also a courageous one.” Connah further affirms the ultimate conclusion of the work, stating that Ehret is “undoubtedly” justified in “identifying an African 'Classical Age,' from 1000 b.c. to a.d. 400, that was of significance in the context of world history.” However, Connah also suggests that Ehret's proposal will inevitably require "revision." The philologist Andrzej Zaborski argues that Ehret had improperly presented his linguistic data, failing to adequately convey which theories were dubious, speculative, or proven, and omitting relevant data regarding attested words, thereby preventing any professional philologists from easily assessing his theories. Similarly, Connah states that—for archaeologists such as himself—evidence from historical linguistics “is regrettably in the ‘black box’ category, that is to say, it is mysterious and difficult to evaluate.” Regardless, the archaeologist Peter Mitchell still criticized Ehret for a purported “chronological looseness,” arguing that “few, if any at all,” of Ehret’s methods of dating linguistic developments would “stand up to independent assessment.” The project has been noted as ambitious.
Ekkehard Wolff, scholar of Afroasiatic languages, writes: " (…). .” ("Ehret’s opus magnum is a steeplechase ride through the most difficult terrain, in which the rider stays in the saddle astonishingly well even at the steepest obstacles and, in the opinion of the reviewer, crashes at only a single hurdle (…tone). It is a nearly impossible, a very courageous, and a possibly epochal book.”) Wolff concludes: " "" ....” ("Ehret has sought to write nothing less than a future classic."). Most reviews have been less positive. Linguist
Alan S. Kaye concluded, in his review of the work, that "Ehret's ideas about PAA will not be the standard ones" and that it had largely failed in its objective to provide a "systematic, comprehensive, and rigorous" reconstruction of Proto-Afroasiatic. On this basis, Gragg concludes that many of Ehret's reconstructions may be disproven by a more thorough analysis of each individual cognate set, which would itself challenge the broader arguments presented in his work. Furthermore, Gragg notes that Ehret relied heavily on the reconstruction of Proto-Afroasiatic biconsonantal roots with root extensions, an interpretation which is itself not unproblematic nor widely accepted. Despite his criticisms, Gragg still praised the work for "drawing attention to an important, and neglected, facet of Afroasiatic etymology." Unlike Oryol and Stolbova, Ehret generally relegated evidence from
Proto-Berber to a more minor role in the reconstruction of Proto-Afroasiatic consonants. Ehret justified this decision, stating that the Proto-Berber consonant inventory had diverged too significantly to be useful towards the reconstruction of Proto-Afroasiatic. The sociologist and linguist Gerard Philippson in his review in the
Journal of African Languages and Linguistics, also raises questions on some of the semantic connections, and he has doubts about the environments of certain sound changes proposed in the book. He has issues as well with Ehret's use of evidence from the Central Sudanic branch of the Nilo-Saharan family, but he finds his arguments relating to the Eastern Sahelian (Eastern Sudanic) branch convincing and "solid.” He avers in conclusion: "." ("Even the researchers who are opposed to this reconstruction will have, in any case, an amount of material, clearly presented throughout, which they can rely on to either challenge or rebuild what is proposed. As a whole, it constitutes a work which cannot be ignored.”) Anthropologist and linguist
Roger Blench published a critical comparison of Ehret's and M. L. Bender's comparative work on the Nilo-Saharan family in in 2000—from its date, seemingly written before the book came out. It may be based, in part, on a preliminary manuscript by Ehret from the early 1990s. ==Books==