10 OpenAI post-training researchers
Members of technical staff, research scientists and a post-training researcher, including people who lead post-training teams, are among these OpenAI post-training researchers. A reader can learn what post-training research at OpenAI involves from people who have done it.
Professionals to explore
Arjun Nair
LinkedInExperience: Member of Technical Staff (Researcher) · OpenAI
Arjun Nair has been Member of Technical Staff (Researcher) at OpenAI since September 2026, and the profile describes Arjun Nair as a researcher at OpenAI working on agentic post-training. The listing also shows Member of Technical Staff (Researcher) at Microsoft from 2025 to 2026 and Graduate Research Assistant at Yale University in 2022.
Eric Mitchell
LinkedInExperience: Member of Technical Staff · OpenAI
Eric Mitchell has been a Member of Technical Staff at OpenAI since July 2024, and the profile says Eric Mitchell co-leads the Post-training Frontiers team within Post-training at OpenAI, with the headline Post-training Frontiers Co-lead. The listing also shows Machine Learning Research Engineer at Samsung Research America from 2018 to 2019.
Hanson Wang
LinkedInExperience: Member of Technical Staff · OpenAI
Hanson Wang has been a Member of Technical Staff at OpenAI since September 2024, and the profile describes research work there that includes helping post-train coding models. Hanson Wang's listing also shows Co-Founder, CTO at Arcwise from 2022 to 2024 and Staff ML Engineer at Meta from 2018 to 2021.
Huida Qiu
LinkedInExperience: Researcher, Post Training · OpenAI
Huida Qiu has been Researcher, Post Training at OpenAI since June 2025, with a headline listing GenAI, LLM, Post Training and RL. Huida Qiu's listing also shows AI Researcher at a stealth-mode GenAI startup from 2024 to 2025, Head of App Ads Optimization at Snap Inc. from 2020 to 2024 and Staff Machine Learning Engineer at Quora from 2017 to 2020.
Ilya Kostrikov
LinkedInExperience: Member of Technical Staff (Research Scientist) · OpenAI
Ilya Kostrikov has been Member of Technical Staff (Research Scientist) at OpenAI since February 2023, a role the profile describes as RLHF research and deployment, including LLM post-training and evaluations. Ilya Kostrikov's listing also shows Postdoctoral Scholar at the University of California, Berkeley from 2021 to 2023 and Research Associate at Google from 2020 to 2021.
John Hallman
LinkedInExperience: Member of Technical Staff · OpenAI
John Hallman has been a Member of Technical Staff at OpenAI since March 2024, with the profile headline Post-training @ OpenAI, and the profile notes that John Hallman formerly worked on pre-training and bio there. The listing also shows Machine Learning Engineer at AKASA from 2022 to 2024 and Machine Learning Engineer at Sisu from 2020 to 2022.
Michelle Pokrass
LinkedInExperience: Member of Technical Staff · OpenAI
Michelle Pokrass has been a Member of Technical Staff at OpenAI since September 2022, with the profile headline Post training at OpenAI. Michelle Pokrass's listing also shows Staff Software Engineer at Clubhouse from 2021 to 2022 and Senior Software Engineer at Coinbase from 2018 to 2020.
Rose E Wang
LinkedInExperience: Member of Technical Staff · OpenAI
Rose E Wang has been a Member of Technical Staff at OpenAI since May 2025, and the profile says Rose E Wang leads Post-training's Model Experience team at OpenAI. The listing also shows a PhD candidacy at Stanford University from 2020 to 2025 and Research Intern roles at Ai2 from 2023 to 2024 and at Google DeepMind in 2020.
Tai Vu
LinkedInExperience: Member of Technical Staff, Research · OpenAI
Tai Vu has been Member of Technical Staff, Research at OpenAI since February 2026, and the profile describes specializing in LLM post-training, reinforcement learning and agent research there. Tai Vu's listing also shows Senior Machine Learning Engineer at Meta from 2022 to 2026 and Undergraduate Student Researcher at the Stanford Artificial Intelligence Laboratory (SAIL) from 2020 to 2021.
Xikun Zhang
LinkedInExperience: Research Scientist · OpenAI
Xikun Zhang has been a Research Scientist at OpenAI since April 2025, with the profile headline Post-training and agent research at OpenAI. Xikun Zhang's listing also shows AI Resident at Chan Zuckerberg Initiative from 2024 to 2025, AI Resident at Google Research from 2019 to 2020 and Research Assistant at the University of Illinois Urbana-Champaign from 2017 to 2019.
Choose the right perspective
Match the person's post-training focus, such as agents, coding, reinforcement learning or model experience, to the question you want answered. Team leads can speak to how post-training work is organized, while individual researchers can describe the day-to-day research.
Questions to take into the conversation
- 01Which post-training problems have taken most of your attention, and why?
- 02What does a typical week of post-training research look like for you?
- 03Which skills from your earlier research or engineering roles have mattered most in post-training work?
Reaching OpenAI post-training researchers
How can I contact one of these OpenAI post-training researchers?
Pick one of the 10 people on this page and choose "Book a paid call", or describe your project to find others. You offer a fee for a 15-minute call or a written answer, Instant Expert finds the person's work email and sends the invitation, and they decide whether to accept. The list covers 1 company: OpenAI, based on profile data retrieved on October 26, 2026. Being listed here doesn't mean someone has agreed to take calls.
How much does it cost to reach OpenAI post-training researchers?
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What if they don't reply?
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Can an AI agent ask one of these OpenAI post-training researchers a question?
Yes. An agent with a USDC wallet on Base can ask one question without an Instant Expert account. It names the person, for example by the LinkedIn URL on this page, and pays per ask over x402 (HTTP 402). The person answers in writing or by voice note, and if nobody answers within 7 days, the payment goes back to the wallet automatically. Claude and ChatGPT can do the same through the Instant Expert connector: setup is at /docs/mcp for Claude and /docs/chatgpt for ChatGPT. x402 docs
About this directory
This is a professional research starting point based on business profile data retrieved on . Titles and companies reflect that source snapshot; roles marked former had ended by then. Check the linked profiles for current details. Inclusion does not imply Instant Expert membership or availability.