Chris Olah for machine learning (I’m thinking in particular of his backpropagation essay), Qiaochu Yuan for math (I’d been following his writing on Math Overflow and MSE for years before discovering to my pleasant surprise that he’s also a frequent LW poster) as well as John Baez and Tim Gowers (their blog posts are, to me the gold standard for research-level math exposition), Sabine Hossenfelder for theoretical physics.
Chris Olah for machine learning (I’m thinking in particular of his backpropagation essay), Qiaochu Yuan for math (I’d been following his writing on Math Overflow and MSE for years before discovering to my pleasant surprise that he’s also a frequent LW poster) as well as John Baez and Tim Gowers (their blog posts are, to me the gold standard for research-level math exposition), Sabine Hossenfelder for theoretical physics.
Seconding John Baez