Gadi Sagiv teaches at the Open University of Israel, where he’s an associate professor in the Department of History, Philosophy, and Judaic Studies. A few years back he was asked to chair the department, and more recently he took on running their Digital Humanities and Social Sciences Hub. Titles aside, his reputation comes from working on two big tracks at once: Hasidic history on one side, and cultural questions—sometimes even odd ones, like the story of a single color—on the other.
Most of his training is in modern Jewish history, with a heavy focus on Hasidism. He’s teamed up with scholars like Marcin Wodziński and Uriel Gellman to sift through mountains of stories and genealogies, then use computer tools to pick apart the networks. A typical project of his might start with marriage records or dynastic tales and end up with data visualizations that show how power and leadership shifted. It’s not common in Jewish studies to lean this hard into digital analysis, but Sagiv does it without abandoning close reading.
The other thread is tekhelet, the biblical blue. He wrote a book on it—Jewish Blues: A History of a Color in Judaism (Penn Press, 2023). The work doesn’t only ask, “what did the dye look like?” but digs into how Jews argued about it, how mystics imagined it, and how the modern revival campaign plays out in religious and cultural life. For him, tekhelet is a case study in how ritual symbols get recycled and re-explained across centuries.
Alongside that, he keeps publishing pieces on Hasidic dynasties. One article tracks marriage alliances across Europe; another uses network analysis to explain how certain lineages tightened their hold. These projects look very different from his color work, but in practice they share the same interest: how symbols and relationships bind communities. Some of it is technical, some of it reads more like cultural history, and the tension between those approaches gives his writing a different flavor than the standard monograph.
Sagiv doesn’t write like someone inside the yeshiva world, and he isn’t aiming for devotional history either. He’s secular, but his research keeps circling back to the same material that religious Jews argue about—how mitzvos get practiced, how colors or customs take on weight. Sometimes his work reads almost anthropological, sometimes more like a social scientist’s map of networks. And then there are the offbeat pieces, like when he treats a single dye as the key to a story that cuts across halacha, mysticism, and politics. It doesn’t line up in a straight line, and maybe that’s the point: his work shifts registers depending on what the sources demand.
