“UD – Rethinking Urban Design Genealogies” is an international seminar organized at DAStU – Politecnico di Milano by Gaia Caramellino and Leonardo Zuccaro Marchi, aimed at presenting and comparing diverse positions on urban design genealogies and legacies moving from three Urban Design History and Theory books, written by Grahame Shane (GSAPP Columbia, New York), Tom Avermaete ( ETH, Zurich)/Janina Gosseye (TU Delft), Eric Mumford ( Washington University in St. Louis). We discussed the different UD genealogies, the cultural matrices, the chronologies and geographies of reference, and the other historiographical and interpretative frameworks. The Seminar is supported by DAStU, Politecnico di Milano and organized in collaboration with GUD_Genealogy of Urban Design Network ( https://gudesign.org/ )