Robert Leech

Robert Leech is a neuroscientist whose work centres on applying neuroimaging methods to characterise how psychedelic compounds alter large‑scale brain dynamics and conscious experience. He has collaborated with leading teams in the field to study healthy volunteers administered LSD, psilocybin and DMT using fMRI, EEG–fMRI and connectivity analyses, and has helped link acute phenomenology (for example ego‑dissolution) to measurable changes in global functional connectivity. His methodological focus includes network and connectivity metrics and their interpretation in the context of altered states.

Leech's publications and collaborative projects have informed hypotheses about the neural basis of psychedelic states and their relevance to psychopathology and psychotherapy — for example work that connects psilocybin‑induced connectivity changes to models of early psychosis and studies that consider implications for psychedelic‑assisted psychotherapy. He is frequently listed as a co‑author on influential neuroimaging papers in the field and has contributed to efforts to integrate neurobiological, clinical and theoretical perspectives on consciousness and therapeutic mechanisms of psychedelics.