Mendels researches primarily the Hellenistic world from various perspectives (beginning with the period of Alexander the Great in the fourth century B.C.E. through the period of Constantine the Great in the fourth century C.E). Many of his works deal with the encounters between the Jews, Christianity, and Paganism, and relate to the themes of historiography, ancient Jewish nationalism, the history of the Catholic Church, public memory, and communication.

Books

The Land of Israel as a Political Concept in Hasmonean Literature

This work was Mendels' first published book, issued in 1987 in Germany by Mohr-Siebeck, Tuebingen, Germany. The book deals with the pseudepigrapha, apocrypha and Jewish Hellenistic literature of the Hasmonean era, works which have not usually been seen in their historical-political context. Mendels deals with the perception of the Land of Israel in the Hasmonean period, and reveals that the question of borders was an open question which was dealt with differently in each decade of the second century B.C.E.

The Rise and Fall of Jewish Nationalism: Jewish and Christian Ethnicity in the Ancient Land of Israel

This book by Mendels, dealing with Jewish nationalism, resonated in the scholarly world beyond ancient historians. It was first published in 1992 by Doubleday in New York, and in paper back in 1997 by William B. Eerdmans in Grand Rapids, Michigan. The book shows that the Jewish approach to nationalism was already strongly implanted in the Jewish community of Palestine in the ancient period. Mendels divides the concept of nationalism into 4 components that shaped nationalism in the ancient period, each one receiving a separate history from the period of the Maccabees until the Bar Kochba revolt. The 4 elements are:

1. . Territory,
2. Leadership — generally kingship, 3. Army, and 4. Temple — conducted by the priests. Mendels concludes that this approach to nationalism was authentically Jewish, although elements of it can be found also in the surrounding pagan world. This book is cited inter alia by modern historians who deal with nationalism.

Jewish Nationalism in the Hellenistic Period

The book deals with the question of Jewish identity based on the literature of the period. It was published in Hebrew by the Broadcast University in 1996, based on a series of lectures on Galei Tzahal.

Identity, Religion, and Historiography: Studies in Hellenistic History

This book is a collection of articles written by Mendels up to 1997. It was published by Sheffield Academic Press in 1998. Some of the studies deal with the noted Hellenistic historian Polybius. A number of articles deal with the encounters between the Jews and the Hellenistic world. Mendels dedicated a significant portion of his research to the literature of the period, from the Greek translation of the Bible through the Pseudepigraphic and apocryphal literature to the New Testament. The literature of Qumran is also dealt with in this collection.

One article deals with the Essenes, comparing the light of their lives with what we know about the Hellenistic utopia, which came into style after the conquests of Alexander the Great.

Another article deals with the issue of reception of historians from the ancient period during the Byzantine period. The article focuses on the Bibliotheka of the 9th century patriarch Photius of Byzantium.

In another article, Mendels defines the concept "creative history". He distinguishes between the rationalist historiographic writings (historians that deal with cause and effect, writing linear narratives that describe the history of a period month by month and year by year) and historiography that make connections between political and social needs by tying them to different social strands in the population (primarily from the Hellenistic world after the conquests of Alexander the Great). In reality, Mendels deals here with the question of how history is "fabricated" in order to create identity in a changing world.

In his comprehensive article on Manetho, the Egyptian priest, Mendels also discusses this question with a focus on Egyptian Hellenism.

In another article, Mendels examines the question of how Paul and the first Apostles accepted the idea of mission. The concept of the mission did not exist in the Judaism that preceded them, and Mendels demonstrates that the ancient Christian mission derived from the concept of mission relating to the traveling Hellenistic gods. This borrowing had a significant impact on the notion of conversion to the new religion.

The Media Revolution of Early Christianity: An Essay on Eusebius's Ecclesiastical History

This book by Mendels was published in 1999 in Grand Rapids Michigan (William B. Eerdmans). In it, he attempts to examine the question of how the Church, which developed as an esoteric entity in the Land of Israel, became in less than 300 years a state religion that encompassed the world. Utilizing subsidiary research from the field of communications (social science), Mendels demonstrates that the church intensively utilized tools of communication to spread its message throughout the ancient world. As a textual basis for his research, Mendels uses Eusebius, a noted church father from the end of the third century and the beginning of the fourth century C.E., who was a bishop in Caesarea in the Land of Israel. Mendels primarily utilizes Eusebius's book, the Church History (while at times relying on his other works such as The Preparation for the Gospel), to demonstrate that we are dealing with a real communication revolution. This book integrates ancient historiographic research with modern research in communication. The communication tools that helped the Church spread out and become a significant organization within the Roman Empire (and later even beyond it) are primarily the following: Christian martyrdom which took place in the public space during particular periods, became a very valuable communication asset. The confrontation between Christian Orthodoxy and the heretical movements within it (the "destructive" ones) caused a commotion that echoed in the public sphere and led to the publicizing of the Church among Pagans and Jews. Furthermore, the creation of a significant organizational network that became an effective communication network (the periodic meetings of local bishops in synods) helped the Church in activating its "branches" throughout the world. An additional tool that Mendels expands upon is the mission (which was lacking in Judaism of the time). The Church made the mission into one of its foundation stones in order to extend its reach to as broad a base of communities as possible. As such, the mission was a most important marketing strategy. Similarly, Mendels draws our attention to the fact that the emperors themselves, both those who persecuted the Christians and those who nullified the decrees, would issue edicts for or against the Christians that were distributed throughout the empire. Even those that were negative in nature added to the other attempts at communication. It was these communication tools (alongside an attractive message), according to Mendels, that transformed the Church into a universal entity.

This book is summarized in a Hebrew article that was published in the periodical Zemanim.

Memory in Jewish, Pagan and Christian Societies of the Graeco-Roman World

This book was published in 2004 by Clark-Continuum in London. It deals with memory in ancient societies of the Greco-Roman world.

Various chapters deal with different types of historical and public memory, and its expression in literature, in historiography, and to some degree in physical monuments. For example, in a chapter on The Persians of Aeschylus, Mendels examines a number of alternative narratives of remembrance that were embedded in the population of Athens after the Battle of Salamis. In another chapter, Mendels shows how the memory of ancient history was created in western society. Historical memory was influenced already in the ancient world by the creation of a canon by historians. Mendels demonstrates the processes by which a canon was created, a process that led to a selectivity of what would remain of the works of historians of the ancient period. Thus, the picture of ancient history in western culture, beginning during the period of the Renaissance, is very partial. The book challenges the concept of collective memory prevailing in research from the time of Maurice Halbwachs; and Mendels claims that it is not entirely correct to talk about collective memory, but rather about partial memory (fragmentary), entrenched within different sub-groups within the collective. These group memories do not necessarily complement each other, but compete and conflict with each other. Mendels was one of the first to deal with these topics within the context of the ancient world.

On Memory: An Interdisciplinary Approach

This book, edited by Doron Mendels, was published in 2007 by Peter Lang in Oxford. The idea developed for Mendels in light of his conclusions in the book surveyed above that in reality one should only talk about partial memories of sub-groups within the collective. The idea launched a conference connected to a group that dealt with communication and the Jewish world in the context of the Institute for Advanced Studies at the Hebrew University in 2005 (some of the participants in the group were Elihu Katz, Menachem Blondheim, Arye Edrei, Tamar Liebes, Shmuel Feiner, Hayim Soloveitchik, Dror Warman and others). The book, which is a collection of the lectures delivered at the conference in the spring of 2007, includes the participation of experts from a variety of disciplines. Among the disciplines connected to memory, articles represented the disciplines of law (Nili Cohen), the brain (from the natural sciences: Edan Segev and Hermona Sorek), anthropology (Yoram Bilu and Moshe Shoked), psychology (Amiya Leiblich and Yonatan Slavin), Hebrew literature (Dan Laor), Israeli society and the holocaust (Arye Edrei) and philosophy (Jeffrey Barash).

Mendels himself wrote the introduction in which he brings a concrete example of the nature of memory from the "public" drawing of the Renaissance period in early Italy. In addition, he wrote an article on the novella of Gunther Grass "Crabwalk", in which he tries to give an example of the fragmentation of memory in contemporary Germany. According to the analysis in the article, the collective memory of World War II exists in Germany as a dark background, but there are groups that have adopted for themselves fragments of memories from the past, at times very marginal, which can bring disastrous results when attempting to revive them.

Zweierlei Diaspora. Zur Spaltung der antiken jüdischen Welt

This book that Mendels wrote in conjunction with Arye Edrei, a professor of Jewish law at Tel Aviv University, and is published in German by Vandenhoek& Ruprecht in Goettingen, Germany, argues that contrary to the accepted scholarly view, the Rabbis in the first centuries of the common era, did not have control or authority over the western Greek-speaking (and subsequently Latin speaking) Jewish diaspora. Neither the Rabbis nor other people cared to translate the rabbinic corpus into Greek or Latin (perhaps from the simple reason that it was kept oral for centuries). Hence the Jews in Asia Minor, Greece, the Aegean Islands, Italy, France, Spain, France, and Egypt, who were Greek speaking, were almost completely cut off from rabbinic Judaism that functioned in the Land of Israel and Babylonia because they had no common language of communication. As a result of this gap, two types of Jews were created — those who accepted rabbinic literature and all that it implies, and those in the west who remained biblical Jews without the oral law that developed in the east. Also the eastern Jews (i.e. in the Land of Israel and eastward in the direction of Babylonia) who did not accept the Rabbis had the potential to accept them (because they new Aramaic and Hebrew, in contrast to the western Jews who practically could not communicate because they lacked the knowledge of these languages). Rabbinic literature, such as the Mishnah, the Talmud and the Midrashim, penetrated into Western Europe only in the eighth and ninth centuries. At that point, the intensive familiarity of the Jews with this literature began. By that point, many of the Jews of Europe had been wiped out, and a not insignificant portion had converted to Christianity. But the remainder of Jews accepted the corpus which was by then written down.

Current research

Mendels has for a number of years been actively writing a comprehensive commentary on the Book of 1Maccabees for the series "Hermeneia", published by Fortress Press.

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In an article published recently in a volume edited by L.I.Levine and D.R.Schwartz (Jewish Identities in Antiquity, Tuebignen, 2009), pp. 41—54 Mendels argues that there exists a gap between the myth of Helleniztaion...which has become a metaphor for the struggle of Jewish continuity over the ages – and the actual historic record from the period itself. The sources from the period do not indicate any real link between Hellenization and the struggle for Jewish religious autonomy in the 160s BCE. Even if representatives of the Seleucid king...probably not the king himself...ordered the Jews to abandon the Torah with all its ritual commandments, the king did not make a further step and ordered their hellenization. The Seleucid kings, in line with Hellenistic kings in general, did not launch a Hellenistic mission and did not have any other strategies of cultural imperialism. The Jews who did undergo a process of Hellenization were a minority and this "conversion" was not forced upon them by the rulers.