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Ruth E. Kastner is a philosopher of science, educator, and author. She received her M.S. in physics from the University of Maryland, College Park in 1992, and then decided she was interested in the foundational aspects being studied at the UMCP Philosophy Department. She received her Ph.D. in Philosophy (History and Philosophy of Science) with J. Bub as her dissertation advisor. She has received two National Science Foundation awards for research into interpretational issues in quantum theory, and is the author of three nonfiction books based on her research:

The Transactional Interpretation of Quantum Theory: The Reality of Possibility (CUP, 2012)

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

Adventures in Quantumland: Exploring Our Unseen Reality (World Scientific, 2019)

She is also author of a screen play,

The Harmony of That Heavenly City (with Judith A. Skillman, self-published, 2017)

and a humor booklet on cats: How to Live like a Cat (self-published, 2018)

In her 'previous life' she studied music, and continues to play piano and sing and occasionally direct a cappella sacred Renaissance music.