Kai-Fu Lee

Research

Kai-Fu Lee earned a PhD at Carnegie Mellon University in 1988 with a thesis on Sphinx, a large-vocabulary, speaker-independent, continuous speech recognition system, and later taught at CMU as an assistant professor. With Hsiao-Wuen Hon and Raj Reddy, Lee described the system in a 1990 overview, which explains how Sphinx used hidden Markov models with new subword units to handle coarticulation across a large vocabulary.³⁵

Career

Lee spent six years at Apple Computer heading its multimedia division and then led Cosmo Software, SGI's multimedia software unit, before joining Microsoft Research in July 1998 as director of advanced interactive systems. At Microsoft, Lee founded Microsoft Research Asia and served as a global vice president, and Lee was later a global vice president at Google and president of its Greater China operations.⁴¹

Lee founded Sinovation Ventures in 2009 and 01.AI in May 2023, and leads 01.AI as CEO.¹²

Products and projects

01.AI released the open-source foundation model Yi-34B in November 2023, followed by Yi-Large in May 2024 and the mixture-of-experts model Yi-Lightning in October 2024. The company then shifted toward enterprise software with its WorldWise enterprise model platform, adding agents with task planning in 2025 and multi-agent capabilities in a later version.¹

Work and contributions

• Sphinx speech recognition system Published research

  Developed Sphinx, a large-vocabulary, speaker-independent, continuous speech recognition system, for a 1988 CMU doctoral thesis, and is first-listed author (as K. F. Lee, with H. W. Hon and Raj Reddy) of "An overview of the SPHINX speech recognition system" (1990), which describes the system's approach based on hidden Markov models.³⁵

Timeline

1. 1988Completed a PhD at Carnegie Mellon University with a thesis on the Sphinx speech recognition system.³
2. 1990Published "An overview of the SPHINX speech recognition system" with Hsiao-Wuen Hon and Raj Reddy.⁵
3. Jul 1998Joined Microsoft Research as director of advanced interactive systems.⁴
4. 2009Founded Sinovation Ventures.¹
5. 2015Received an honorary Doctor of Business Practice degree from Carnegie Mellon University.³
6. May 2023Founded 01.AI and became its CEO.¹
7. Nov 202301.AI released the open-source foundation model Yi-34B.¹
8. Oct 202401.AI released Yi-Lightning, a mixture-of-experts language model.¹

Other documented roles

Roles the sources document that are not confirmed as current.

• Global Vice President, Google¹³
• Global Vice President; founded Microsoft Research Asia after joining Microsoft Research in 1998 as director of advanced interactive systems, Microsoft¹⁴
• Headed the multimedia division (six years), Apple Computer⁴¹
• Assistant Professor; earned a PhD there in 1988 with the Sphinx thesis, Carnegie Mellon University³⁴

Where they work

• 01.AI 1 person in the wiki

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