Robert G. Jahn

Robert G. Jahn (1930–2017) was a distinguished American aerospace engineer and plasma physicist who served as Dean of the School of Engineering and Applied Science at Princeton University and was a leading authority on electric propulsion.

His scientific standing was beyond question when, in 1979, prompted by an undergraduate’s proposal, he founded the Princeton Engineering Anomalies Research (PEAR) laboratory to investigate—rigorously and quantitatively—whether human consciousness could affect physical systems.

That a mainstream engineering dean would devote nearly three decades to such a question made PEAR uniquely controversial and visible. Working with his long-time collaborator, the psychologist Brenda Dunne, Jahn ran millions of trials in which operators attempted, by intention alone, to bias the output of random event generators (REGs)—electronic devices producing random sequences—and to influence macroscopic systems such as a large mechanical cascade of bouncing balls.

Summarized in Margins of Reality (1987), PEAR reported small but statistically persistent deviations from chance correlated with operator intention. Jahn’s contribution to the mind-power lineage was thus to attempt a statistical, laboratory demonstration that intention can nudge physical probability—giving manifestation discourse its most-cited “experimental” support, even as mainstream physics disputed the effect sizes, methodology, and interpretation, and the lab closed in 2007.