Hongyuan Mei

Currently, I am working on an interesting project with a few friends.

Previously, I was a Member of Technical Staff at xAI, leading the AI Experts team. My team and I have made core contributions to Grok reasoning models, including Grok 4, Grok 4 Heavy, and Grok 4.1 Fast. My team shipped Grok in Tesla, and drove deep collaboration across xAI, Tesla, SpaceX, and beyond.

Before joining xAI, I was a Senior Research Scientist at Google DeepMind. Before DeepMind, I was a Research Assistant Professor at Toyota Technological Institute at Chicago (TTIC), a research institute affiliated with University of Chicago. At TTIC, I led the River Lab, conducting research on AI reasoning and planning.

I received PhD in Computer Science from Johns Hopkins University, advised by Jason Eisner. We developed the neural Hawkes process, a model widely used in event sequence modeling and prediction.