I am a Research Sceintist at xAI, previously working at OpenAI. I'm recognized as pretraining lead of Grok2-mini, a core contributor to GPT-4o, and inventor of GPT4-Turbo long-context algorithm, and a primary contributor to DALL-E 3, and the first contributor to OpenAI Embedding. My research interest lies in machine learning, optimization, large language models, numerical methods and theories.