Sihan Yuan
AI Researcher at Fireworks AI
San Francisco, California, United States
Summary
👤
Senior🎓
Top SchoolSihan Yuan is an AI researcher in San Francisco with 11 years of experience bridging astrophysics and machine learning, currently focusing on post-training methods and reinforcement learning at Fireworks AI. He earned a PhD from Harvard in Astronomy & Astrophysics and completed a postdoc at Stanford where he developed efficient probabilistic universe models, agent systems, and verifiable benchmarks to accelerate astrophysics research. His work combines large-scale simulation-driven modeling, data compression, and deep learning accelerators to make inference at cosmological scales tractable. Previously he built Bayesian galaxy–dark matter connection pipelines and did quantitative research at Two Sigma, reflecting a blend of rigorous theory and production-minded experimentation. Notably, he brings uncommon fluency in both scientific inference and applied RL workflows, enabling research that is both reproducible and deployable.
10 years of coding experience
3 years of employment as a software developer
Doctor of Philosophy (Ph.D.), Astronomy and Astrophysics, 3.96/4, Doctor of Philosophy (Ph.D.), Astronomy and Astrophysics, 3.96/4 at Harvard UniversityBachelor of Arts, Astrophysics, 3.95/4. summa cum laude, Phi Beta Kappa, Sigma Xi, Bachelor of Arts, Astrophysics, 3.95/4. summa cum laude, Phi Beta Kappa, Sigma Xi at Princeton University
English, Chinese
Github Skills (28)
markdown10
cosmology10
gitpod10
github-pages10
jekyll10
python9
halo9
astrodynamics7
hydrodynamics7
science6
atmospheric-modelling6
astrophysics5
scientific-computing4
monte-carlo4
clustering4
Programming languages (3)
Github contributions (5)
SandyYuan/GRAND-HOD
Nov 2017 - Jul 2018
Contributions:44 commits, 25 pushes in 8 months
differentiablepythonthe-standard
SandyYuan/sandyyuan.github.io
Aug 2021 - Mar 2025
Github Pages template for academic personal websites, forked from mmistakes/minimal-mistakes
Contributions:14 PRs, 87 pushes, 8 branches in 3 years 7 months
templategithub-pages-templatemmistakesmistakesjekyll
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