My C.V.

Ruth E. Kastner



Academic site:


Ph.D., History and Philosophy of Science, University of Maryland, College Park; August, 1999.

M.S., Physics, University of Maryland, College Park; May, 1992.

B.S., Physics, cum laude with High Honors in Physics, University of Maryland, College Park; May, 1982.

B.M.Ed., Peabody Institute of Johns Hopkins University, Baltimore, MD; 1979.

State of Virginia Teaching Certification in Physics (Postgraduate Professional License), 2005-2010.


1999-present: Research Associate, Department of Philosophy, University of Maryland, College Park; member, Foundations of Physics Group, UMCP.

Fall, 2004 – Spring, 2014: Adjunct Professor, University of Maryland University College, College Park, MD (Humanities and Philosophy instructor; principal author of PHIL336 course rewrite: “Ideas Facing the 21st Century”.) In 2010, served on faculty teams to develop Course Outcome and Teaching Guides for courses redesigned under UMUC’s SEGUE program.

Fall, 2004: Associate Adjunct Professor, George Mason University, Fairfax, VA (Philosophy of Science).

Summer, 2003: Instructor, Montgomery College, Silver Spring, MD (Electromagnetism).

Fall, 2002: Instructor, Howard Community College, Columbia, MD. (College Algebra).

Spring, 2001: Adjunct Assistant Professor, United States Naval Academy (Philosophy of Science); Adjunct Professor, Georgetown University (Philosophy of Science).

Fall, 2000: Adjunct Assistant Professor, United States Naval Academy (Philosophy of Science); Instructor, University of Maryland Baltimore County (Introduction to   Philosophy); Instructor, Howard Community College (Introduction to Philosophy).

Fall, 1999-Spring, 2000: Instructor, Howard Community College (Introduction to Philosophy).

Fall, 1999: Faculty Research Assistant, Institute for Physical Science and Technology (IPST), UMCP. Researched and wrote the 50th Anniversary History of IPST.


Fall, 2003: Recipient of National Science Foundation Grant 01-159 , Science and Technology Studies Program, award no. SES-0323201.

Fall, 2001: Recipient of National Science Foundation Grant 97-142, Science and Technology Studies Program, award no. SES-0115185.


Adventures in Quantumland: Exploring Our Unseen Reality. World Scientific; April, 2019.

Understanding Our Unseen Reality: Solving Quantum Riddles. Imperial College Press (2015).

The Transactional Interpretation of Quantum Mechanics: The Reality of Possibility. Cambridge University Press (2012).

Editor (with J. Jeknic-Dugic and G. Jaroszkiewicz), Quantum Structural Studies. World Scientific Publishers, Singapore (2016).


“Decoherence in the Transactional Interpretation,” forthcoming in International Journal of Quantum Foundations.

“Unitary-Only Quantum Theory Cannot Consistently Describe the Use of Itself: On the Frauchiger-Renner Paradox.” Foundations of Physics, in press.

“The ‘Delayed Choice Quantum Eraser’ Neither Erases Nor Delays,” Foundations of Physics 49, 717-727 (2019).

“Quantifying Absorption in the Transactional Interpretation,” with John G. Cramer, Int’l Jour. Quan. Foundations, Vol. 4, Issue 3, 210-222 (2018).

“On the Status of the Measurement Problem: Recalling the Relativistic Transactional Interpretation,” Int’l Jour. Quan. Foundations, Volume 4, Issue 1, pages 128-141 (2018).

“The Relativistic Transactional Interpretation: Immune to the Maudlin Challenge,” in Probing the Meaning and Structure of Quantum Mechanics. D. Aerts, M.L. Dalla Chiara, C. de Ronde and D. Krause (Eds.), World Scientific, Singapore (2018). arXiv:1610.04609

“Are Dark Matter and Dark Energy Different Aspects of the Same Physical Process?” Frontiers in Physics (2018)

“Taking Heisenberg’s Potentia Seriously,” with Stuart Kauffman and Michael Epperson, IJQF 4:2, 158-172 (2018).

From Quantum to Classical Physics: The Role of Distinguishability,” in Quantum Worlds, ed. O. Lombardi et al (Cambridge University Press, 2018). arXiv:1707.09034

“On Quantum Non-Unitarity as a Basis for the Second Law of Thermodynamics,”
Entropy 19(3) (2017). arXiv:1612.08734

“Demystifying Weak Measurements,” Found Phys 47: 697. (2017).arXiv:1702.04021

“Violations of the Born Rule: Implications for Macroscopic Fields,” International Journal of Quantum Foundations 2(3), pp. 121-126. (2016). arXiv:1603.05301

“The Emergence of Spacetime: Transactions and Causal Sets,” in Licata, I. (Ed.), Beyond Peaceful Coexistence. Singapore: World Scientific (2016). arXiv:1411.2072

“The Transactional Interpretation: an Overview,” Philosophy Compass 11(12), 923-932. (2016). arXiv:1608.00660

“Antimatter in the direct-action theory of fields,” Quanta 5(1), pp. 12-18. (2016). arXiv:1509.06040

“The Born Rule and Free Will,” in C. DeRonde et al (Eds). Probing the Meaning of Quantum Mechanics: Superposition, Dynamics, Semantics and Identity. Singapore: World Scientific (2016), pp. 231-243.. Preprint version:

“Is There Really “Retrocausation” in Time-Symmetric Approaches to Quantum Mechanics?”

Forthcoming in Proceedings of the AAAS Pacific Division meeting, San Diego (2016). arXiv:1607.04196

“Haag’s Theorem as a Reason to Reconsider Direct-Action Theories,” International Journal of Quantum Foundations 1(2), pp. 56-64. (2015). arXiv:1502.03814

“Einselection of Pointer Observables: The New H-Theorem?” Studies in History and Philosophy of Modern Physics 48: 56–58. (2014). Preprint version:

“Maudlin’s Challenge Refuted: A Reply to Lewis,” Studies in History and Philosophy of Modern Physics 47: 15-20 (2014). Preprint version:

“On Real and Virtual Photons in the Davies Theory of Time-Symmetric Quantum Electrodynamics,” Electronic Journal of Theoretical Physics 11, No. 30 (2014) 75–86. Preprint version:

“The Possibilist Transactional Interpretation and Relativity,” Foundations of Physics 42, 1094-1113 (2012)

“On Delayed Choice and Contingent Absorber Experiments,” ISRN Mathematical Physics. doi:10.5402/2012/617291 (2012)

“De Broglie Waves as the “Bridge of Becoming” Between Quantum Theory and Relativity,” Foundations of Science, doi: 10.1007/s10699-011-9273-4 (2011).

“Quantum Nonlocality: Not Eliminated by the Heisenberg Picture,” Foundations of Physics 41, 1137-1142 (2011).

“The Quantum Liar Experiment in Cramer’s Transactional Interpretation,” Studies in History and Philosophy of Modern Physics 41, 86-92 (2010).

“On Visibility in the Afshar Two-Slit Experiment,” Foundations of Physics 39, 1139-1144 (2009).

“Cramer’s Transactional Interpretation and Causal Loop Problems, “ Synthese 150, 1-14. (2006).

“Why the Afshar Experiment Does Not Refute Complementarity,” Studies in History and Philosophy of Modern Physics 36, 649-658. (2005)

“Shutters, Boxes, but no Paradoxes: Time Symmetry Puzzles in Quantum Theory,”International Studies in Philosophy of Science 1, 89-94. (2004).

“Weak Values and Consistent Histories in Quantum Theory,” Studies in Historyand Philosophy of Modern Physics 35, 57-71 (2004).

“The Nature of the Controversy Over Time-Symmetric Quantum Counterfactuals,”                                                                                                                                 Philosophy of Science 70, 145-163 (2003).

“Comment on Mohrhoff’s ‘What Quantum Mechanics is Trying to Tell Us,’” American Journal of Physics 69, 860 (2001).

“A Critical Look at Time-Symmetric Quantum Counterfactuals,” contributed paper, Philosophy of Science Association Conference, Vancouver, B.C.; April, 2000.

“The Three-Box Paradox and Other Reasons to Reject the Counterfactual Usage of the ABL Rule,” Foundations of Physics 29, 851-863 (1999).

“TSQT ‘Elements of Possibility’?,” Studies in History and Philosophy of Modern Physics 30, 399-402 (1999).

“Time-Symmetrized Quantum Theory, Counterfactuals, and ‘Advanced Action’,” Studies in History and Philosophy of Modern Physics 30,   237-259 (1999).

“Time-Symmetrized Quantum Theory and Counterfactuals,” Fortschritte der Physik 46, 881-887 (1998); special focus issue: Fundamental Problems in Quantum Theory, University of Maryland Baltimore County, August 4-7, 1997.

“Geometrical Phase Effects and Bohm’s Quantum Potential,” in Fundamental Problems in Quantum Theory: A Conference in Honor of John A. Wheeler; eds. D. Greenberger and A. Zeilinger, Annals of New York Academy of Sciences vol. 755, 866-7 (1995).

“Geometrical Quantum Phase Effect and Bohm’s Quantum Potential,” American Journal of Physics 61, 852 (1993).

Book review of David Albert’s Time and Chance, Philosophy of Science 69, 400-404 (2002).


Invited Speaker: Copenhagen Interpretation and Beyond, Chapman University, Orange, CA. Oct. 18-19, 2019.

Invited Speaker, International Workshop: The Conceptual Foundations of Science: Rethinking Matter, Life, Mind. Parmenides Foundation, Tegernsee, Germany, Sept. 19, 2018.

Invited Speaker, “The Transactional Interpretation and its Relativistic Extension.”Lecture Series on Foundations of Science: Scientific Realism, University of Vienna, Austria, June 21, 2018.

Invited Speaker, Quantum Mechanics Meets Neuroscience. Foundations of Mind, California Institute for Integral Studies, San Francisco, January 27, 2017.

Invited Speaker, International Workshop: Identity, Indistinguishability and Non-locality in Quantum Physics. Philosophy of Science Group, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina, June 26-30, 2017.

Invited Speaker: Mind, Matter and the New Real, Esalen Center for Teaching and Research, Big Sur, CA; Dec. 3-8, 2017.

Invited Speaker: Workshop on Retrocausal Approaches in Quantum Theory, AAAS Conference, San Diego, CA; June 15-16, 2016. Paper in proceedings: “Is there really retrocausation in time-symmetric theories of quantum mechanics?” arXiv:1607.04196

Invited Speaker: Workshop, Scientific Realism About the Quantum State. University of Leeds, UK, Sept. 9, 2015. (

Invited Speaker: “Free Will and Retrocausality in the Quantum World,” a conference under the auspices of the JTF-funded project, New Agendas for the Study of Time, Trinity College, Cambridge, 1-4 July 2014 (

Invited Speaker: 2013 Växjö Conference on Foundations of Physics: “Quantum Theory: Advances and Problems,” Växjö, Sweden, June 2013.

Invited Speaker: “The Broken Symmetry of Time,” AAAS Conference on Retrocausation, June 13-14, 2011; University of San Diego; AIP Conf. Proc. 1408, pp. 7-21; doi:

Invited Speaker: Workshop on Retrocausality and Time Symmetry, University of Miami. January 12, 2011.

Invited Speaker: “Cramer’s Transactional Interpretation and the Quantum Liar Experiment,” Retirement symposium for Prof. Cramer, Seattle, WA; Sept. 10-11, 2009.

Invited Speaker: “Weak Values and Cramer’s Transactional Interpretation,” Conference on Time-Symmetry and Quantum Mechanics, July 23-26, 2005; University of Sydney. Published in Proceedings: Studies in History and Philosophy of Modern Physics 39, 806-818 (2008).


Guest Post, George Musser’s Scientific American Weblog, “Critical Opalescence”, June 21, 2012.

Guest Post, NPR: “Quantum Physics and the Need for a New Paradigm,”

Video Interviews:

With Jeffrey Mishlove, New Thinking Allowed:

“Interpretations of Quantum Mechanics,”

“The Reality of Possibility,”

“Time’s Arrow and Free Will,”

With Deepak Chopra, Curious Minds (preview version):

With Zain Khan, The Query:

Presentation at Chapman University Workshop:

Presentation at Buenos Aires Workshop:

Presentation at Tennessee Valley Interstellar Workshop, Oct. 2018:

Podcast Interview: Starytime, (interview begins at 15 min)

Podcast Interview: Coast to Coast A.M.,

Podcast Interview: Adam Alonzi,


Appearance and Reality 1,

Appearance and Reality 2,

Educational animation (with Science Animated): “Quantumland and Transactions,”

Referee services for Synthese, Philosophy of Science, Studies in History and Philosophy of Modern Physics, Foundations of Physics, Southern Journal of Philosophy, Foundations of Science, Entropy, International Studies in Philosophy of Science, International Journal of Quantum Foundations.