Stuart is an anesthesiologist and quantum consciousness theorist whose work focuses on the nature of consciousness, the mechanism of anesthesia, and the quantum biology of microtubules. In the 1980s, he developed models of microtubule information processing within neurons that challenged mainstream paradigms in neuroscience and artificial intelligence. In the mid-1990s, alongside Sir Roger Penrose, he co-developed the Orchestrated Objective Reduction (Orch OR) theory, which proposes that consciousness arises from quantum vibrations and computations orchestrated inside brain microtubules. His research also explores anesthetic action on microtubules and the clinical application of transcranial ultrasound for mental health and neurological conditions.
Stuart earned his B.S. in Chemistry from the University of Pittsburgh in 1969 and his M.D. from Hahnemann Medical College in Philadelphia in 1973. At the University of Arizona since 1975, he became a professor in the Departments of Anesthesiology and Psychology and Director of the Center for Consciousness Studies in 1999, and has served as Professor Emeritus since 2003. He founded The Science of Consciousness conference in 1994—the longest-running interdisciplinary conference in the field—and co-founded the Penrose Institute in 2017. He has written or edited five books, including Ultimate Computing (1987), and published over 100 scientific articles and book chapters.
To further explore his career and theories on quantum biology in the brain, watch Is Your Brain A Quantum Orchestra Tuned To The Universe?, which highlights his foundational work on microtubules and consciousness.