- Dr. Yael Kedar
- Multidisciplinary Studies
- Education - B.A.
- History of science
- History of philosophy
- Medieval science and philosophy
- Early modern science and philosophy
- The idea of progress
- Christian theology
- Philosophy of religion
- Laws of nature
- Roger Bacon
Dr. Yael Kedar is a senior faculty member of the Multi-disciplinary studies department (philosophy branch) at Tel-Hai College and a research fellow at the philosophy department of the University of Haifa.
She has written on Robert Grosseteste, Roger Bacon, and Albert the Great’s physics and metaphysics of light, often related to issues of Christian theology. Her current projects concern accounts of action at a distance, the ontological status of color, and the mathematical epistemology of Roger Bacon.
October 2021- September 2024: Research grant by the ISF for a three-years-long project (with Prof. Giora Hon, University of Haifa – Individual Research Grant) – ‘” Certainty without doubt and truth without error’: The mathematical epistemology of Roger Bacon”
February to August 2019 – Senior Fellow fellowship at IKFG Project, “Fate, Freedom and Prognostication” at Friedrich Alexander University, Erlangen, Germany.
March 2017 – ISF Workshop Grant (70,000 NIS, with Prof. Giora Hon) for the workshop “Laws and Order: The status of Natural regularities before the scientific revolution”.
October 2013 – September 2016 - Research grant by the ISF for a three-years-long project (with Prof. Giora Hon, the University of Haifa as PI – Individual Research Grant) – “Roger Bacon (1214–1294) and the Making of the Concept of Law of Nature”.
November 2008 – June 2009 – By the department of Philosophy at Georgetown University, Washington D.C. Research grant/ Postdoctoral fellowship for the academic year 2008-9.
July 2008 – By the European Science Foundation, funding for participation in the ESF-NPHS Postgraduate Summer School “The Soul from the Aristotelian scientia de anima to Early Modern Psychology” in Radboud University, Nijmegen (The Netherlands).
July 2007 – By the department of Philosophy at Georgetown University, Washington D.C. Funding for participation in a workshop on editing medieval philosophical and theological manuscripts.
2006 – By the Swiss Philosophy Fund, administrated by KKL-JNF. A grant for doctoral candidates and researchers in the field of philosophy.
“Plotinus' Conception of Unity and Multiplicity as the Root to the Medieval Distinction between Lux and Lumen.” Studies in the History and Philosophy of Science, 37 (2006): 379–397.
“Questioning Aristotle: Roger Bacon on the True Essence of Colour”. The Journal of Medieval Latin 17 (2008).
“The Intellect Naturalized: Roger Bacon on the Existence of Corporeal Species within the Intellect”. Early science and Medicine 14 (2009): 131-157. Also published in Sylla, E. D. and Newman, W. N. (eds.) (2009) Evidence and Interpretation in Studies on Early Science and Medicine. Leiden: Brill.
"The Nomological Image of Nature: Explaining the Tide in the Thirteenth Century". Annals of Science 73(1) (2016): 68-88.
“Laying the Foundation for the Nomological Image of Nature: From Corporeity in Robert Grosseteste (c. 1168 – 1253) to Species in Roger Bacon (1220 – 1292)”. In J. P. Cunningham (ed.), Robert Grosseteste and the Pursuit of Religious and Scientific Learning in the Middle-Ages, pp. 165–185. Springer (2016).
(with G. Hon) “‘Natures’ and ‘Laws’: the Making of the Concept of Law of Nature Robert Grosseteste (c. 1168 – 1253) and Roger Bacon (1214/1220 – 1292)”. Studies in the History and Philosophy of Science Part A 61 (2017): 21-31.
(with G. Hon), “Roger Bacon (c. 1220-1292) and his System of Laws of Nature: Classification, Hierarchy and Significance”. Perspectives on Science 26 (2017): 719-745.
(with G. Hon) guest editors, special issue. “Law and Order: The status of natural regularities before the scientific revolution.” Studies in History and Philosophy of Science Part A 81 (2020).
(with Dominique Demange), “Physical action, species and matter: The debate between Roger Bacon and Peter John Olivi”. Journal for the History of Philosophy 58 (2020): 49–59.
(with Nicola Polloni), The Philosophy and Science of Roger Bacon – Studies in Honour of Jeremiah Hackett (London: Routledge, 2021).
“Sound is not Made of Rays: Roger Bacon’s Rejection of Heavenly Music”. In N Polloni and Y Kedar (eds.), The Philosophy and Science of Roger Bacon – Studies in Honour of Jeremiah Hackett (London: Routledge, 2021), pp. 141-158.
(with Nicola Polloni), “Introduction”. In N Polloni and Y Kedar (eds.), The Philosophy and Science of Roger Bacon – Studies in Honour of Jeremiah Hackett (London: Routledge, 2021), pp. 1-16.
(with Jeremiah Hackett) The Philosophy of Roger Bacon. Guest editors, special issue of Revista Española de Filosofía Medieval (forthcoming in January 2022).
“Virtus and species in the Philosophy of Nature of Roger Bacon (c. 1220-1293)”, Revista Española de Filosofía Medieval (forthcoming in January 2022).
December 2021 – The University of Haifa Philosophy Department Research Colloquium: “On the Nature of Physical Action: Time, Causality and Virtus. The Debate between Roger bacon and Peter John Olivi”. (Heb.) (Invited lecture
October 2021– Analysis and Synthesis in Historical and Systematic Perspectives, Sawyer Seminar, “Propter quid demonstrations in physics and the method of analysis: Robert Grosseteste and Roger Bacon”, Bloomington University, Indiana (invited lecture, on zoom).
October 2121– The ontological Status of colours in Ancient, Arabic and Latin Philosophy, “Real and apparent colours: The Multiplication of species interpretation”, Universite Paris 1 Panthéon-Sorbonne – Gramata (invited lecture).
September 2021 – Aristotle’s De sensu in the Latin Tradition, 1150-1650, “How is Colour Generated? Roger Bacon on Light, Transparency and the Elements”, KU Leuven, Belgium (invited lecture).
July 2021 –Teatime with Bacon Lectures Series, “The motion of the scale and Bacon’s scientific method”, Roger Bacon Research Society (invited lecture, on zoom)
April 2021 – 96th Annual Meeting of the Medieval Academy of America, “Is Vision the Paradigmatic Sense? Roger Bacon’s Doubts on the Analogy between Sight and Hearing”, Bloomington University, Indiana. (on zoom)
December 2020 – The Cohn Institute Research Seminar, Tel Aviv University: "Roger Bacon on Sounds, Rays and Celestial Music” (Heb.). (Invited lecture)
July 2020 – IKGF Lecture Series at Friedrich-Alexander Universität, Erlangen: “Roger Bacon's natural (and historical) astrology and the manipulation of nature (and history) - a matter of progress?” (Invited lecture)
February 2020 - Prime Matter: The Ontological Stakes of Physical Endurance, “Dimensions, Quantity and Geometry in Roger Bacon’s Conception of Matter”, Humboldt University, Berlin. (invited lecture)
July 2019 – History of Science Society annual meeting 2019, Utrecht, Netherlands. Paper read:” Laws of Nature and Nature’s Use and Manipulation According to Roger Bacon (C. 1220-1292)”
February 2019 – Israel Philosophical Association 22nd Annual Conference, Bar Ilan University. Paper read (with Adam Weiler Gur-Arye): “Berkeley’s Problem of Induction; Hume’s Problem of Induction”.
June 2018 – Theories of Causal Powers in the Thirteenth and the Fourteenth Century, KU Leuven, Belgium. Paper read: "Virtus, Order and the Universal Law of Nature in Roger Bacon’s Communia naturalium".
April 2018 – Science, Imagination and Wonder: Robert Grosseteste and his Legacy, Pembroke College, Oxford, UK. Paper read: “Astrology, Universal Law, Machina mundi and the Order of Nature in the Thirteenth Century”.
September 2017 – EPSA17, Exeter, UK. Paper read: “Roger Bacon (1214/1220–1292) on Universal and Particular Natures: Sources and Influence”.
July 2017 – The BSHS Annual Conference, York, UK. Paper read: “Roger Bacon (c. 1220–1292) and his System of Laws of Nature: Classification, Hierarchy and Significance”.
April 2017 – The sixteenth congress of the Israeli Association for the History and Philosophy of Science, Raanana. Israel. Paper read: “Particular Laws and the Universal Law of Nature from the Middle Ages to the Seventeenth Century”.
October 2015 –The First Dutch seminar in Medieval Philosophy. Groningen, The Netherlands. Paper read: “Natural Astrology, Astrological optics – the Road to Laws in Nature?”
September 2015 – The Narses Project International Conference – Science and Religion, at the National Hellenic Research Foundation. Athenes, Greece. Paper read: “Are Laws of Nature Legislated by God? Roger Bacon (1120-1292) and Voluntarism”.
July 2014 – Robert Grosseteste and the Pursuit of Religious and Scientific Learning in the Middle-Ages. Bishop Grosseteste University 3td International Conference. Paper read: "The Form of Corporeity and the Nomological Image of Nature".
August 2012 – SIEPM 2012– Pleasures of Knowledge –International Conference of Medieval Philosophy, Freising, Germany. Paper read: “Ethical Voluntarism, Rationality, and the Practical Intellect in Roger Bacon”.
July 2009 – XXIII International Congress of History of Science and Technology. Ideas and Instruments in Social Context, Budapest, Hungary. Paper read: “The Sense of Hearing and the Reconsideration of the Practical Sciences in Roger Bacon”.
May 2007 – Medieval Science Colloquium VII. Boston College. MA. Paper read: “Nature and Reason: Roger Bacon on the Existence of Species within the Intellect”.
October 2006 – International Conference on Ancient and Medieval Philosophy. Fordham University, NY. Paper read: “Some Innovative Aspects of the Notion of Species in Roger Bacon”.
August 2006 – The 5th International Congress for Medieval Latin Studies – Interpreting Latin Texts in the Middle Ages. York University and the University of Toronto. Paper read: “Questioning Aristotle: Roger Bacon on the True Essence of Colour”.
October 2005 – The 30th Patristic, Medieval, and Renaissance Studies (PMR) Conference. Villanova University, PA. Paper read: “From Plotinus to the 13th century: a Story of Two Lights”.
September 2005 – The Third Annual Midwestern Conference in Medieval Philosophy, Marquette University, Milwaukee, Wisconsin. Paper read: “Some 13th Century Philosophers on the Differences between Lux and Lumen”.
March 2005 – The 5th annual Conference of the Israeli Society for the History and Philosophy of Science, the Van Leer Institute, Jerusalem. Paper read: (in Hebrew): “On the Luminary and its Light: Unity and Multiplicity in 13th Century Optics and Epistemology”.
October 2004 – Columbia University’s 15th Annual Graduate Student’s Conference: “Seeing things – Vision in the Middle Ages”, Columbia University, NY. Paper read: “Lux and Lumen: two Notions of Light in 13th Century Philosophy that Capture the One and the Many”.
March 2016 – The Philosophies of Robert Grosseteste and Richard Rufus of Cornwall a conference organized by the Center of Medieval Philosophy at Georgetown University, Washington DC. Paper read: ‘From “Natures” to Laws: the Making of the Concept of Law of Nature by Robert Grosseteste and Roger Bacon’.
December 2011 – Philosophy Colloquium, University of Haifa. Paper read (in Hebrew): “Voluntarism and Empiricism in Late Medieval and Early Modern Philosophy”.
November 2009 – The Haifa Seminar for the History of Science and Ideas in the Pre-Modern World. Paper read (in Hebrew): “Roger Bacon on the Sense of Hearing and the Status of the Practical Sciences”.
November 2009 – Philosophy Colloquium, University of Haifa. Paper read (in Hebrew): “The Concept of Species in Medieval Philosophy”.
April 2009 – Medieval Studies Forum, Georgetown University. Paper read: “Roger Bacon’s Invention of Speculative Grammar”.