Anthony Aguirre is an American cosmologist and professor of physics at UC Santa Cruz, best known in the AI governance space as co-founder of the Future of Life Institute (FLI), which organized the influential 2023 open letter calling for a six-month pause on advanced AI training. His work sits at the intersection of cosmology and [[Existential Risk]], making him a key figure in the [[TESCREAL]] network connecting academic physics to [[AI Safety]] policy advocacy and [[Effective Altruism]] funding streams.