(1955, 1932) with providing an "orthodox" quantum mechanics demonstrating mathematically the essential role of quantum physics in the mind. Stapp has taken interest in the work of Alfred North Whitehead. He has proposed what he calls a "revised Whiteheadianism". He has also written a chapter "Whiteheadian Process and Quantum Theory" (pp. 92–102) in the book Physics and Whitehead: Quantum, Process, and Experience (2003). His philosophy has been described as being influenced by both Heisenberg's physical realism and Bohr's idealism. A form of panpsychism Philosopher Gordon Globus noted that "Stapp unhesitatingly descends into panexperientialism". Stapp has co-authored papers with Jeffrey M. Schwartz. Schwartz has connected the work of Stapp with the concept of "mental force" and spiritual practices of Buddhism. Reception Stapp's work has drawn criticism from scientists such as David Bourget and Danko Georgiev. Recent papers and a book by Georgiev criticize Stapp's model in two aspects: (1) The mind in Stapp's model does not have its own wavefunction or density matrix, but nevertheless can act upon the brain using projection operators. Such usage is not compatible with standard quantum mechanics because one can attach any number of ghostly minds to any point in space that act upon physical quantum systems with any projection operators. Therefore, Stapp's model does not build upon "the prevailing principles of physics", but negates them. (2) Stapp's claim that quantum Zeno effect is robust against environmental decoherence directly contradicts a basic theorem in quantum information theory according to which acting with projection operators upon the density matrix of a quantum system can never decrease the Von Neumann entropy of the system, but can only increase it. Stapp has responded to Bourget and Georgiev stating that the allegations of errors are incorrect. Selected publications Stapp, H; Schwartz, J. M; Beauregard, M. (2005). Quantum theory in neuroscience and psychology: A neurophysical model of mind-brain interaction. Philosophical Transactions of the Royal Society of London, Series B. 360 (1458): 1309-1327. Full paper Stapp, H; Schwartz, J. M; Beauregard, M. (2004). The volitional influence of the mind on the brain, with special reference to emotional self-regulation. In Beauregard, M. (Ed.). Consciousness, emotional self-regulation, and the brain, Philadelphia, PA: John Benjamins Publishing Company, Chapter 7. Stapp, H. (2009). Mind, Matter and Quantum Mechanics (The Frontiers Collection). Springer. Stapp, H. (2011). Mindful Universe: Quantum Mechanics and the Participating Observer. Springer. Stapp, H. (2017). Quantum Theory and Free Will: How Mental Intentions Translate