Hyung Won Chung
Also known as Hyung Chung, 정형원
Hyung Won Chung is an AI researcher whose work spans large language models, reasoning and agents. He earned a PhD at MIT in 2019 and worked at Google Brain on T5X, PaLM and instruction-tuned Flan models. He joined OpenAI in 2023 and contributed to o1 and Deep Research. He is an AI research scientist at Meta Superintelligence Labs, where he joined in July 2025.
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Publication numbers from OpenAlex, as of 15 October 2026. Citations and h-index are hidden because this OpenAlex record may be incomplete or mix in other authors.
Timeline
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2019
A doctorate at MIT
He earns a PhD at MIT in 2019.
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2019–2023
Research at Google Brain
At Google Brain, he works on T5X, PaLM, Flan-PaLM, Flan-T5 and reasoning. In 2022, he coauthors “Scaling Instruction-Finetuned Language Models,” which finds that instruction tuning improves performance across language-model families and releases Flan-T5 checkpoints.
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2023
Joining OpenAI
He joins OpenAI in early 2023 to work on reasoning and agents. In November 2023, he gives a Yonsei University lecture on large language models.
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2024
OpenAI's o1 models
He becomes a foundational contributor to o1-preview and o1 in 2024.
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February 2025
Deep Research
He contributes to OpenAI's Deep Research as a foundational contributor in February 2025.
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Since July 2025
Research at Meta
He joins Meta Superintelligence Labs in July 2025 and serves as an AI research scientist there as of October 2026.
Sources and credits
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