Prof. Avi Loeb

Avi Loeb is what the UAP field has long claimed to want and rarely gets: a working, senior, mainstream scientist willing to attach his name and his methods to the question of non-human technology. Whether colleagues see that as a gift or an embarrassment is a live argument inside academia — which is precisely why he matters here.

Who he is

Loeb is the Frank B. Baird Jr. Professor of Science at Harvard, a prolific astrophysicist who has published hundreds of papers on black holes, the early universe, and the search for life. He chaired Harvard’s astronomy department for nearly a decade and has held senior advisory roles in U.S. science policy.

His public turn toward the anomalous began with 'Oumuamua, the first known interstellar object to pass through our solar system, detected in 2017. Its unusual shape and non-gravitational acceleration led Loeb to argue, in papers and a bestselling book, that the possibility it was an artificial light sail deserved serious scientific consideration rather than reflexive dismissal.

Why he matters

Loeb’s significance is methodological. Rather than debate eyewitnesses, he insists on the astronomer’s instinct: build instruments, collect data, publish results. In 2021 he founded the Galileo Project at Harvard to do exactly that — deploying telescopes and sensors to systematically scan the sky for, and characterize, objects of unknown origin, with the explicit goal of moving UAP from anecdote to measurement.

That stance has made him both a hero and a heretic. Supporters see him legitimizing a field that badly needs rigor and academic cover. Critics — including many fellow astronomers — argue he overstates thin evidence (the 'Oumuamua debate is far from settled in his favor) and that his expeditions, such as a controversial seafloor search for interstellar meteorite fragments, outrun what the data support.

For this field guide, Loeb is the face of the scientific-search approach embodied by the [[galileo-project]]. He represents a bet that the subject’s best path forward is not disclosure of old secrets but new, open, peer-reviewable data — the same instinct, pointed at the cosmos, that drives the instrument-first turn in UAP research generally.