machine-learning-systems
(2)
Simon Mo
Simon Mo is the CEO and co-founder of Inferact, the startup commercializing vLLM, the open-source inference engine he helped create and now leads as lead maintainer. A PhD student at UC Berkeley's Sky Computing Lab advised by Ion Stoica and Joseph Gonzalez, Mo has spent roughly eight years building high-throughput, memory-efficient model-serving systems, from Ray Serve at Anyscale to vLLM, which now powers inference for companies including Amazon. In January 2026 he and his vLLM co-maintainers raised a $150M seed round at an $800M valuation, co-led by Andreessen Horowitz and Lightspeed.
Ying Sheng
Ying Sheng is the co-founder and CEO of RadixArk, an AI infrastructure company that spun out of SGLang, the open-source inference engine she helped create in 2023. SGLang now runs across hundreds of thousands of GPUs and serves trillions of tokens a day for Google, Microsoft, NVIDIA, xAI and others. A Stanford computer science PhD and former xAI technical staff who co-led the inference team behind Grok, she launched RadixArk in May 2026 with $100 million in seed funding led by Accel at a $400 million valuation, on a mission to make frontier-level AI infrastructure open and accessible to everyone.