[10][3][11][1] Despite having left academia more than two decades prior,[4] Weinstein was invited to give a lecture at Oxford University's Clarendon Laboratory in May 2013, where he presented his proposed theory of everything called "Geometric Unity" (GU).

[4] Physicists expressed skepticism about GU,[5] and criticized Weinstein and du Sautoy for not publishing any equations related to the theory, which is a normal part of scholarly peer review in physics.

[5] Science writer Jennifer Ouellette criticized the favorable coverage given to the theory by The Guardian, arguing that experts could not properly evaluate Weinstein's ideas without a published paper.

[14][15] As of 2024[update], he is a member of the research team on The Galileo Project, founded by astrophysicist Avi Loeb to investigate potential signs of extraterrestrial technology.

[16][independent source needed] Weinstein coined the term "intellectual dark web", later popularized by New York Times opinion editor Bari Weiss.