The Center for Jewish Art
The Hebrew University of Jerusalem
| 1945-1951 | The Hebrew University of Jerusalem (General and Jewish History, Hebrew Literature), M.A. |
| 1958-1959 | The Courtauld Institute of Art, University of London, (Art History), B.A. |
| 1962 | The Warburg Institute, University of London (Art History), Ph.D. Subject of Thesis: The Golden Haggadah; Supervisors: Prof. Francis Wormald and Prof. Hugo Buchthal |
| 1999 | Recipient of the Israel Prize |
| 1998 -1999 | Princeton University, Department of Art and Architecture, Visiting scholar |
| 1997-1998 | Center for Advanced Study in theVisual Arts, National Gallery of Art, Washington D.C., Samuel H. Kress Professor. |
| Since 1991 | Center for Jewish Art, The Hebrew University of Jerusalem, Chairman, Academic Committee. |
| 1987-1988 | Centre National de la Recherche Scientifique, Paris, Member. |
| Since 1985 | Wolf Foundation, Israel, Board Member. |
| 1979-1991 | The Hebrew University of Jerusalem, The Center for Jewish Art, Founder and Director. |
| 1984-1985 | Brown University, Providence, Rhode Island, Guest Professor. |
| Since 1984 | The Hebrew University of Jerusalem, Nicolas Landau Professor of Art History. |
| 1983 | Institute of Fine Arts, New York University, Guest Professor. |
| 1982 | The Hebrew University of Jerusalem, Full Professor. |
| 1979-1980 | Institute for Advanced Study, Princeton, Member. |
| 1977-1979 | The Hebrew University of Jerusalem, Institute of Fine and Performing Arts, Literature and Languages, Chairman. |
| Since 1975 | Catalogue of Hebrew Illuminated Manuscripts in the British Isles, under the auspices of the Israel Academy of Sciences and Humanities and the British Academy, London, Chairman. |
| Since 1975 | Diaspora Museum, Tel Aviv University, Art Advisor. |
| 1974-1976 | The Hebrew University of Jerusalem, Institute of Fine Arts, Chairman. |
| 1974-1986 | Journal of Jewish Art, Editor-in-Chief. |
| Since 1974 | Index of Jewish Art, under the auspices of the International Union of Academies, Founder and Director. |
| Since 1976 | Israel Museum, Jerusalem, Board Member. |
| 1973-1980 | Gesta, International Center of Medieval Art, Foreign Editor. |
| 1972 | The Hebrew University of Jerusalem, Associate Professor. |
| 1971-1974 | The Hebrew University of Jerusalem, Department of Art History, Chairman. |
| 1969-1970 | Harvard University, Dumbarton Oaks Center for Byzantine Studies, Senior Fellow |
| 1969 | The Hebrew University of Jerusalem, Senior Lecturer. |
| 1965-1970 | Encyclopaedia Judaica, Illustration Editor, Editor of Art |
| 1964 | The Hebrew University of Jerusalem, Lecturer. |
| 1963-1975 | Massada Press, Art Editor. |
| 1963-1994 | The Hebrew University of Jerusalem, Department of Art History. |