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Jimmy Ba

Associate professor, University of Toronto

Jimmy Ba is an associate professor of computer science at the University of Toronto and a Canada CIFAR AI Chair. He co-authored the Adam optimizer with Diederik Kingma and Layer Normalization with Jamie Ryan Kiros and Geoffrey Hinton. He co-founded xAI in 2023 and left in February 2026.123

At a glance

Current role
Associate professor of computer science
Work listed
1
Sources cited
3
Profile reviewed

Accomplishments

  • Co-author of the Adam optimizer.3
  • Former xAI co-founder; U of T associate professor.21

Adam and academic career

Ba co-authored Adam (2014) and Layer Normalization; Adam later received an ICLR Test of Time Award. The University of Toronto promoted him to associate professor with tenure in 2024.13

xAI

He was among xAI's founding researchers in 2023. CNBC and Business Insider reported his February 2026 departure, the second co-founder exit in two days.2

Work and contributions

Timeline

  1. Adam paper.3
  2. Co-founded xAI.2
  3. Left xAI.2

Other documented roles

Roles the sources document that are not confirmed as current.

  • Co-founder (former), xAI2

Where they work

Suggest a correction or removal

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References

3 sources · profile reviewed Oct 23, 2026 · data updated Oct 23, 2026

  1. Jimmy Ba — U of T Computer Science newsUniversity of Toronto · Official page · accessed Oct 23, 2026
  2. Musk's xAI loses second co-founder Jimmy BaCNBC · News report · published Feb 10, 2026 · accessed Oct 23, 2026
  3. Jimmy Ba — Associate Professor, University of TorontoYesPress · published Sep 29, 2026 · accessed Oct 23, 2026