Books (Research):
Materia Philosophiae: Material Dimensions of Ancient Greek Philosophy, co-editor and contributor, Brill in the Euhormos Series Anchoring Innovations in Greco-Roman Philosophy, 2026.
The Metaphysics of the Pythagorean Theorem: Thales, Pythagoras, Engineering, Diagrams, and the Construction of the Cosmos out of Right Triangles, Ancient Philosophy Series, State University of New York Press, May 2017; paperback edition January 2018.
Archaeology and the Origins of Philosophy, Ancient Philosophy Series, State University of New York Press, 2010; paperback edition 2011.
Anaximander in Context: New Studies on the Origins of Greek Philosophy, co‑authored with Dirk Couprie and Gerard Naddaf, Ancient Philosophy Series, State University of New York Press, 2003; 2nd printing 2004. Hahn’s monograph: “Numbers and Proportions in Anaximander and Early Greek Thought,” pp. 72–163.
Anaximander and the Architects: The Contribution of Egyptian and Greek Architectural Technologies to the Origins of Greek Philosophy, Ancient Philosophy Series, State University of New York Press, 2001; 2nd printing 2005.
Kant’s “Newtonian Revolution” in Philosophy, The Journal of the History of Philosophy Monograph Series, January 1988.
Books (Course Texts):
Conduct and Constraints: Testing the Limits of the Harm Principle, Simon & Schuster, 1994, fifth edition, 1998; from 1998 onwards bought out by Pearson Educational Publishing, tenth edition 2014.
Formal Deductive Logic: A Logic Workbook, Simon & Schuster, 1993, fifth edition, 1998; bought out by Pearson Educational Publishing from 1998 onwards. Eleventh edition, 2016.
Self‑Identity and Moral Decisions, The Ginn Press 1989, second edition, 1991.
Articles in Professional Journals:
“On Plato’s Philebus 15B‑8,” Phronesis, Vol. XXIII, No. 2, 1978, pp. 158‑172.
“SYNAGÔGE and the Problem of TO ΠEPAS in Plato’s Philebus 25Cl‑E5,” Philosophical Research Archives, November 1978, pp. 1‑21.
“‘Necessity’, ‘Objectivity’, and the Structure of Transcendental Arguments in Kant’s First and Second Critiques,” Southwest Philosophical Studies, April 1978, pp. 126‑133.
“Aristotle as Ontologist or Theologian?: Or, Aristotelian Form in the Context of the Conflicting Doctrines of Being in the Metaphysics,” The Southwest Journal of Philosophy, Vol. X, No. 1; 1979, pp. 79‑88.
“Truth (Aletheia) in the Context of Heidegger’s Critique of Plato and the Tradition,” Southwest Philosophical Studies, Vol. IV, Spring 1979, pp. 51‑57.
“Material Causality, Non‑being and Plato’s Hypodoche: A Re‑View of the Timaeus in terms of the Divided Line,” Apeiron, Vol. XIV, No. 1, fasc. 2, 1980, pp. 57‑66.
“Being and Non‑Being in Rig Veda X, in the Writings of the Lao‑Tzu and Chuang‑Tzu, and in the ‘Later Plato,’” The Journal of Chinese Philosophy, Vol. VIII, June 1981, pp. 119‑142.
“Knowledge and Death in Plato’s Theaetetus,” Southwest Philosophical Studies, Vol. VI, No. 3, April 1981, pp. 82‑87.
“Continuity, Discontinuity, and Some Paradoxes of Motion: Zeno’s Arguments in the Light of Quantum Mechanics,” Southwest Philosophical Studies, Vol. VII, April 1982, pp. 115‑123.
“Geocentrism, Heliocentrism, and the Circular Orbits of the Heavenly Bodies: Some Conceptual Problems in Early Greek Astronomy,” Southwest Philosophical Studies, Vol. VIII, No. 3, Spring 1983, pp. 58‑65.
“A Note on Plato’s Divided Line,” Journal of the History of Philosophy, Vol. XXI, No. 2, April 1983, pp. 235‑237.
“Recollecting the Stages of Ascension: Plato’s Symposium 211C3‑Dl,” Southwest Philosophical Studies, Spring 1985.
“Anaximander and Architects,” Proceedings of the Society for Ancient Greek Philosophy, December 1992.
“Imagining Philosophical Rationality: A Case Study of Archaeology’s Contribution to Early Greek Philosophy,” SKEPSIS, A Journal for Philosophy and Interdisciplinary Research, XV/ii-iii, 2004, pp. 372-395.
“Heidegger, Anaximander, and the Greek Temple,” http://www.tu-cottbus.de/BTU/Fak2/TheoArch/Wolke/eng/Subjects/071/Hahn/hahn.htm, 2007.
“Heraclitus, Milesian Monism, and the Felting of Wool,” in Heraklit im Kontext, eds. Enrico Fantino, Ulrike Muss, Charlotte Schubert, Kurt Sier, Walter DeGryter: Berlin and Boston, 2017.
“Did Aristotle get the Origins of Philosophy Wrong?” Aristotle 2400 years. The Proceedings of World Congress 23-28 May 2016. Ed. Demetra Sfendoni-Mentzou. Ancient Stageira, Ancient Miez: Aristotle University of Thessaloniki, 2019, pp. 610-615.
“Structural Form as an Analogical Source for Structures of Nature:”, May 24, 2019, Journal of the National Science Foundation of Sri Lanka, 2019, 47 (3): 323-331
“Architectural Technologies and the Origins of Philosophy” in “The Origins of Western Thought,” 2020, in ARCHAI, The Journal of Ancient Philosophy, 29, pp. 1-29, Brazil.
BIG THINK, series of three essays:
“Hidden Philosophy of the Pythagorean Theorem,” Big Think. Published 7 June 2021: https://bigthink.com/thinking/hidden-philosophy-pythagorean-theorem/
“Thales: Ancient Greeks built the cosmos with right triangles,” Published 12 July 2021: https://bigthink.com/thinking/thales-theorem/
“Should the Pythagorean theorem be renamed the Thalean theorem?” Big Think. Published: 23-August 2021. https://bigthink.com/culture-religion/pythagorean-theorem-renamed-thalean-theorem
“Thales, the ‘Pythagorean Theorem’, and Technological Context” in Dialogues d’histoire canadienne, “Cahiers de l’atelier Clistène,” 5, 48/2, 25-51, 2022e
“The Gnomon as Module for Thales and Anaximander: A technique is always an application that is enveloped by a theory,” In Politeia: Studies in Ancient Philosophy in Honor of Professor Anthony Preus, Leiden, The Netherlands: Brill, March 2023.
Chapters in Books:
“What Did Thales Want to be When He Grew‑Up? Or, Re‑Appraising the Roles of Engineering and Technology on the Origins of Early Greek Philosophy/Science,” in Plato, Time, and Education: Essays in Honor of Robert S. Brumbaugh, Brian Hendley, editor, State University of New York Press, 1987, pp. 107‑129.
“Technology and Anaximander’s Cosmical Imagination: A Case-Study for the Influence of Monumental Architecture on the Origins of Western Philosophy/Science,” in New Directions in the Philosophy of Technology, (Society for Philosophy and Technology, Vol. 6), Joseph C. Pitt and Paul Durbin, editors, Kluwer Academic Publishers, 1995, pp. 95-138.
“Heraclitus, Milesian Monism, and the Felting of Wool,” in Heraklit im Kontext, Walter DeGryter, Germany, 2017, pp. 187-211.
“Mythos and Logos on New Year’s Day: Trial and Error in Anaximander’s Seasonal Sundial” in Logoi and Muthoi: Further Essays in Greek Philosophy and Literature, Ancient Philosophy series, State of New York University Press, 2019, pp. 95-134.
“Did Aristotle Get the Origins of Philosophy Wrong?” Aristotle 2400 Years: The Proceedings of the World Congress, 23–28 May 2016, ed. Demetra Sfendoni-Mentzou, Ancient Stageira and Ancient Mieza: Aristotle University of Thessaloniki, 2019, pp. 610‑615.
“The Gnomon as Module for Thales and Anaximander: A Technique Is Always an Application that is Enveloped by a Theory” in Studies in Ancient Greek Philosophy in Honor of Professor Anthony Preus, edited by D. M. Spitzer, 56-76. New York: Routledge, 2022.
“Material Modular Thinking, Substance Monism, and the Origins of Greek Philosophy: Architecture, Gnomon, Coinage, and the Felting of Wool,” Materia Philosophiae: Material Dimensions of Ancient Greek Philosophy, William Wians and Robert Hahn, eds., Brill, Euhomors Series anchoring Innovations in Greco-Roman Studies, 2025, pp. 15‑62.
Book Reviews:
J. C. B. Gosling, Plato: Philebus (Translation, Commentary, Notes) Clarendon Press, Oxford, 1975, The Classical Journal, Vol. 73, No. 4, April‑May 1978, pp. 363‑366.
W. H. Werkmeister, Facets of Plato’s Philosophy, edited as a supplementary volume of Phronesis, 1977, The Journal of the History of Philosophy, Vol. XIX, No. 2, April 1981, pp. 242‑245.
Robert W. Hall, Plato, London: George Allen and Unwin, 1981, Canadian Philosophical Review, Vol. 3, No. 5, 1983.
Ermanno Bencivenga, Kant’s Copernican Revolution, Oxford University Press, 1987, The Review of Metaphysics, 1989.
Robin May Schott, Cognition and Eros: A Critique of the Kantian Paradigm, Boston: Beacon Press, 1989, Canadian Philosophical Reviews.
Jonathan Barnes, The Toils of Scepticism, Oxford University Press, 1990, Canadian Philosophical Reviews, March 1992.
Leo Groarke, Greek Scepticism, McGill/Queens University Press, 1990, Canadian Philosophical Reviews, March 1992.
Anthony Preus (ed), Before Plato: Essays in Ancient Greek Philosophy VI, State University of New York Press, 2004, in International Philosophical Quarterly, 2003.
Albert Presas I Puig, Praktische Geometrie und Kosmologie am Beispiel der Architektur, Alogorismus, Studien zur Geschichte der Mathematik und der Naturwissenschaften Herausgegeben von Menso Folkerts, 1998, in ISIS, 2003.
Rene Brague, The Wisdom of the World, University of Chicago Press, 2003, in Philosophy in Review, 2004.
Daniel Graham, Explaining the Cosmos: The Ionian Tradition of Scientific Philosophy. Princeton: Princeton University Press, 2006, in the Journal of the History of Philosophy, June 2008.
Professor Robert Hahn 