PeopleofSuperintelligence

Lab leader

James R. Lee

James R. Lee is a computer scientist and OpenAI research lead whose current work covers language models and reasoning. He coauthored the 2004 measured descent paper, earned degrees at Purdue and Berkeley, and worked at the Institute for Advanced Study before joining the University of Washington faculty in 2006. At UW, he became a professor of computer science and published 2023 work showing that Euclidean and metric growth exponents coincide in reversible random networks. After coauthoring Phi-4 at Microsoft in 2024, he joined OpenAI in December 2024 and became Research Lead for Reasoning in April 2025; he leads core STEM and SWE reasoning and has helped build o3, GPT-4.1, and GPT-5.

Now at
OpenAI
Links
Website

Timeline

  1. 1997–2006

    Degrees and measured descent

    He earns an honors BS in mathematics and computer science at Purdue from 1997 to 2001, then a computer science PhD at Berkeley in 2005 under advisor Christos H. Papadimitriou. In 2004, he coauthors measured descent, a method for embedding finite metric spaces, with Robert Krauthgamer, Manor Mendel, and Assaf Naor. He works as a postdoctoral researcher at the Institute for Advanced Study in Princeton from August 2005 to September 2006, then joins UW's faculty in 2006.

  2. 2006–2025

    Professor of computer science at UW

    By 2010, he is an assistant professor of computer science at UW, whose interests span algorithms, complexity theory, analysis, geometry, and probability. His computer science faculty appointment runs from September 2006 to September 2025; he serves as associate professor from September 2011 to August 2016 and as professor of computer science.

  3. 2017–2026

    Simons Investigator

    He holds a Simons Investigator appointment from 2017 through 2026.

  4. 2023

    Growth exponents in networks

    In 2023, he publishes work on reversible random networks showing that the Euclidean growth exponent coincides with the metric growth exponent.

  5. April 2024–November 2024

    Technical staff at Microsoft AI

    He works as a Member of Technical Staff at Microsoft AI from April 2024 to November 2024.

  6. December 2024

    Phi-4 technical report

    In December 2024, he coauthors Microsoft's Phi-4 technical report, which presents a 14-billion-parameter language model developed with a training recipe focused on data quality.

  7. December 2024–March 2025

    Researcher in OpenAI Foundations

    At OpenAI, he serves as a Researcher in Foundations from December 2024 to March 2025.

  8. Since April 2025

    OpenAI reasoning research lead

    He becomes OpenAI's Research Lead for Reasoning in April 2025 and leads its core STEM and SWE reasoning capabilities. He builds language models and helps build o3, GPT-4.1, and the GPT-5 model series.

Career

  1. NowOpenAIResearch lead
  2. 2024MicrosoftMember of Technical Staff
  3. 2005–2006Institute for Advanced StudyPostdoctoral Researcher
  4. University of WashingtonAssistant Professor

Education

  1. 2005University of California, Berkeley
  2. 2001Purdue UniversityHonors BS in mathematics and computer science

From the biography.

Videos

YouTube videos in which James R. Lee speaks or appears, newest first. A model chose them from YouTube search results. List updated 20 October 2026.

  1. Prof. James R Lee | Cover times of graphs, majorizing measures, and the Gaussian free fieldINI Seminar Room 1 · 15 December 2025 · 1 h 3 min
  2. James R.Lee (UWashington):Online learning, competitive analysis, and the shadows of gradient descentComputational Complexity · 23 February 2020 · 57 min
  3. James R. Lee - Unimodular uniformization and random walksDepartment of Mathematics - Northwestern University · 27 August 2019 · 56 min
  4. James LeeElegance in Probability · 17 September 2017 · 50 min

All 5 videos of James R. Lee

Video data from YouTube API Services. By watching you agree to the YouTube Terms of Service. How we use YouTube data.

  1. 22 of 133 people shaping AI with a former OpenAI role now work at AnthropicIncludes James R. Lee. Our estimates of where OpenAI recruits came from and where 133 people with former OpenAI roles work now, including the companies and labs they founded.
  2. Google alumni have founded or led 133 other organizations, more than any other AI labIncludes James R. Lee. We estimate that alumni of 17 major AI labs went on to found or lead 350 other organizations, including 226 they founded, and we trace 472 career moves directly between 23 labs since 2010.
  3. Among employers with 30+ full-time cases, OpenAI leads primary technical role H-1B pay at $310,000, and Amazon, Google and Microsoft file 57% of all casesIncludes OpenAI. Across 440,669 certified US H-1B filings from 44 employers (FY2020–FY2026), OpenAI leads primary technical role base pay at $310,000 and xAI leads overall base pay at $290,000.
  4. The median h-index is 48 at universities and 14 at frontier AI labsIncludes OpenAI. The median h-index is 48 at universities and 14 at frontier AI labs. We compare publishing careers, recent citations, dual appointments and job moves across 2,420 university researchers and 308 frontier-lab researchers.

Colleagues

People with dated positions at the same organization in the same years.

Sources and credits

Photo: We have no published photo of James R. Lee yet. Send us a free-licensed photo.

  1. Measured descent: A new embedding method for finite metrics arxiv.org. Checked 21 October 2026.
  2. Theory Colloquium - Microsoft Research microsoft.com. Checked 21 October 2026.
  3. Curriculum Vitae homes.cs.washington.edu. Checked 21 October 2026.
  4. James R. Lee homes.cs.washington.edu. Checked 21 October 2026.
  5. Phi-4 Technical Report arxiv.org. Checked 21 October 2026.
  6. Phi-4 Technical Report - Microsoft Research microsoft.com. Checked 21 October 2026.