Ansh Tiwari is Co-Founder of Rasyn, a Y Combinator-backed AI platform building toward a general intelligence for chemistry through its flagship product, Marigold.

Ansh studies Physics at Caltech, where he conducted research with scientists from Nvidia and DeepMind, and previously worked at NASA JPL on cutting-edge scientific computing.

Ansh brings a rare fusion of deep physics expertise and AI research experience, giving him firsthand insight into the fragmented, tool-heavy workflows that slow down modern chemistry and materials science.

At Rasyn, Ansh co-built Marigold, an autonomous chemistry agent that accepts plain-language tasks, pulls relevant literature, selects the right computational tools, runs calculations, and returns results with full reasoning.

Rasyn is backed by Y Combinator and is actively used by chemists to automate multi-step workflows, with the platform capable of screening thousands of compounds autonomously in a single session.