Jacques Vallée

French-American computer scientist, venture capitalist, and UAP researcher who pioneered the 'interdimensional hypothesis' — that UAPs are not alien spacecraft but manifestations of an unknown phenomenon that interacts with human consciousness and has done so throughout history.

Proposed the interdimensional hypothesis as an alternative to the extraterrestrial hypothesis — arguing that UAP behavior (instant acceleration, apparent violation of physics) is more consistent with something interacting with consciousness and spacetime than with nuts-and-bolts spacecraft.