OpenAI

The predicate means participation in founding; the source wording is founding member, not a statement of legal founder status.

Founding participation documented by the December 2015 launch announcement; year precision does not assert an incorporation date.

The predicate means participation in founding; the source wording is founding member, not a statement of legal founder status.

Founding participation documented by the December 2015 launch announcement; year precision does not assert an incorporation date.

Retrospective first-person year-precision account; not a legal incorporation claim.

Retrospective career account supplies these boundaries at the stored precision; no exact joining or departure day inferred.

Retrospective year-precision role interval; founding participation is a separate claim.

Retrospective career account supplies these boundaries at the stored precision; no exact joining or departure day inferred.

The predicate means participation in founding; the source wording is “founding members”, a group of research engineers and scientists, not a statement of legal founder status.

Founding participation documented by the December 2015 launch announcement; year precision does not assert an incorporation date.

The predicate means participation in founding; the source wording is “founding members”, a group of research engineers and scientists, not a statement of legal founder status.

Founding participation documented by the December 2015 launch announcement; year precision does not assert an incorporation date.

The predicate means participation in founding; the source wording is “founding members”, a group of research engineers and scientists, not a statement of legal founder status.

Founding participation documented by the December 2015 launch announcement; year precision does not assert an incorporation date.

The predicate means participation in founding; the source wording is “founding members”, a group of research engineers and scientists, not a statement of legal founder status.

Founding participation documented by the December 2015 launch announcement; year precision does not assert an incorporation date.

The predicate means participation in founding; the source wording is founding member, not a statement of legal founder status.

Founding participation documented by the December 2015 launch announcement; year precision does not assert an incorporation date.

This is a historical role snapshot. Neither the appointment date nor the end of the role is established by this record.

The date identifies this documented announcement or publication; it does not establish a continuing state.

Historical title snapshot, not a current role.

Role snapshot at the dated source; no start, end or continuing appointment inferred.

This is a historical role snapshot. Neither the appointment date nor the end of the role is established by this record.

The date identifies this documented announcement or publication; it does not establish a continuing state.

This is a historical role snapshot. Neither the appointment date nor the end of the role is established by this record.

The date identifies this documented announcement or publication; it does not establish a continuing state.

The announcement gives no title, start date or end date.

Announcement date; not a start date.

An advisory role as announced; no end date is recorded.

Announcement date; not a start date.

A printed author affiliation does not establish employment, a job title, a start date or tenure, and says nothing about any earlier or concurrent affiliation.

Snapshot of the affiliation printed in arXiv v1 dated 2017-06-12; not an employment start date.

Board role only. The announcement also envisages continued advice and donations, so this is not an end to every association.

Date of the public board-departure announcement; no general employment-end date is inferred.

Printed affiliation does not establish employee/contractor status or tenure. Johns Hopkins University is also listed; affiliation is not exclusive.

Snapshot of the affiliation printed in arXiv v1 dated 2020-01-23; not an employment start date.

Printed affiliation does not establish employee/contractor status or tenure.

Snapshot of the affiliation printed in arXiv v1 dated 2020-01-23; not an employment start date.

An announced departure, not an exact employment boundary. The unnamed new project is not equated with Anthropic in this record.

Public announcement date. The body mentions an employee announcement earlier that month; the exact final working day is not given.

Role identified at departure announcement; neither appointment date nor final working day is established.

Snapshot at the dated source announcement; no employment interval or current appointment is inferred.

An author affiliation; it does not establish when he joined OpenAI, a title or tenure.

arXiv v1 submission date.

Retrospective participant account of prior employment, not an independently verified last working day.

The interview specifies summer 2022; the schema retains year precision rather than inventing a day. Start unknown.

Retrospective first-person account; end-year precision is not an exact departure date.

Retrospective career account supplies these boundaries at the stored precision; no exact joining or departure day inferred.

The announcement does not give an exact start date or establish a continuing role.

Announcement date; not a start date.

An announced appointment. OpenAI’s March 2025 leadership update refers to him as Chief Operating Officer with an expanded remit.

Announcement date; not a start date.

The announcement does not give an exact start date. It says she had led research, product and partnership functions over the previous 18 months.

Announcement date; not a start date.

Role description follows the source; no formal title, transfer edge or current appointment inferred.

Retrospective career account supplies these boundaries at the stored precision; no exact joining or departure day inferred.

Team leadership within OpenAI, not a separate employer, ownership stake or proof of the team’s stated outcomes.

Role assignment at the dated team announcement; not a full tenure interval.

Team leadership within OpenAI, not a separate employer, ownership stake or proof of the team’s stated outcomes.

Role assignment at the dated team announcement; not a full tenure interval.

The announcement records the team’s formation and leader. OpenAI’s May 2024 committee announcement lists him as Head of Preparedness; no end date is recorded here.

Announcement date of the team; not a start date.

A first-person announcement of acceptance. The record does not establish start or end dates; OpenAI announced Altman’s return as CEO on 29 November 2023, in which Altman thanked “Emmett” for his role.

Date of the post (UTC); not a start or end date.

An announced return to a prior role; no end date is recorded here.

Announcement date; not a start date.

The start year rests on reporting. The personal page still described him as an OpenAI researcher when retrieved on 15 October 2026, after his reported Tencent appointment; it is not evidence of a current role. No OpenAI announcement or departure date was retrieved. English rendering of the Chinese passage is a machine translation; no human translation review.

Year of joining as reported; start month and end not established. The personal page is undated.

A first-person announcement. The post does not name his role; his own career account describes the 2023–2024 return (existing record).

UTC date of the post (13 February in US Pacific time); the post says he left “yesterday”.

The record rests on reporting (Quartz, which says the move was first reported by Business Insider and Gizmochina); it does not establish a start date or an exact leaving date.

End month as reported; the start is not given in this source.

The departure date and the team rest on reporting (Business Insider, citing two people familiar with the situation). The stated reason is Kokotajlo's own wording on an undated profile page, read as it stood when retrieved; Business Insider quoted the same wording from the profile on 9 May 2024. The record does not establish a title or a last working day.

Month of the departure as reported by Business Insider on 9 May 2024 (“last month”); no dated announcement by Kokotajlo was retrieved, and his profile statement is undated (retrieved 15 October 2026).

Appointment announcement, not a current title claim.

Snapshot of the announced appointment; no exact effective date inferred.

Do not convert this announcement into an exact effective departure or end of every affiliation.

Announcement date only; the passage does not establish a final working day.

A first-person announcement, dated by his first post. The stated reason is his own account in the thread of 17 May and is attributed, not adopted.

UTC date of his post “I resigned” (04:43 UTC; 14 May in US Pacific time), the convention for X posts. His thread of 17 May 2024 states that his last working day was the previous day.

A dated title on an announcement; it does not establish when the role began or ended.

Role as shown in the announcement of that date.

A dated title on an announcement; it does not establish when the role began or ended.

Role as shown in the announcement of that date.

An announced appointment; no start date or continuing role is established.

Announcement date; not a start date.

An announced appointment; the record does not establish a start date or how long he held the title. His own later account of his roles is recorded with his departure.

Announcement date; not a start date.

The record rests on reporting of OpenAI's confirmation; no title is given. Fortune dates his departure from xAI to April 2024 from his LinkedIn profile; that departure is an existing record.

Date of the report; not a start date.

The record rests on reporting: Engadget relays a statement Altman made in July 2024 (Engadget does not name where; it links to Reuters), which could not be retrieved. Weng's part of the same statement is recorded separately. The record does not establish a title, a start date or how the role was divided.

Month of Altman's statement as dated by Engadget (“back in July 2024 … at the time”); Obsolete also dates the takeover to July 2024. Not a start date.

The record rests on reporting: Engadget relays a statement Altman made in July 2024 (Engadget does not name where; it links to Reuters), which could not be retrieved. It does not establish a title, a start date or how the role was divided; Weng's role as Head of Safety Systems and her November 2024 departure are recorded separately.

Month of Altman's statement as dated by Engadget (“back in July 2024 … at the time”). Not a start date.

The record rests on reporting (CNBC, citing sources familiar with the situation and a statement OpenAI gave CNBC); The Information first reported the move. No OpenAI announcement was retrieved; a reply by Sam Altman on X reported elsewhere could not be located. The record does not establish a title for the new role or how long Madry held it.

Date of the report; the report places the reassignment in the previous week. Not a start date.

A first-person announcement. The retrieved text of the note is truncated, so his statement about where he would go is not used; his biography records research on Anthropic’s Alignment Science team (existing record).

UTC date of the post (5 August in US Pacific time); not a last working day.

The appointment rests on reporting (TechCrunch, relaying Altman's note, whose full text could not be retrieved). Achiam's own post of 11 February 2026 confirms that he held the title. The record does not establish a start date.

Date of the report of Sam Altman's note to staff; not a start date.

The record rests on reporting: TechCrunch relays a post on X by Sam Altman; Altman’s and McGrew’s own notes were posted in forms whose text could not be retrieved.

Date as reported; not a last working day.

The record rests on reporting: TechCrunch relays Murati’s post on X, whose note was posted as an image and could not be machine-checked. The record does not establish her last working day.

The Wednesday of TechCrunch’s report of 25 September 2024 (a Wednesday), the date of the announcement as reported; not a last working day.

The post names no title; the title and the partnership with Pachocki rest on TechCrunch’s reporting of Altman’s post, whose full text could not be retrieved.

UTC date of the post (25 September in US Pacific time).

A first-person announcement. The title rests on TechCrunch’s reporting of Sam Altman’s post. The retrieved text of the note is truncated.

UTC date of the post (25 September in US Pacific time).

The record rests on reporting (Bloomberg, as carried by Fortune, and Maginative); no OpenAI title or start date is given.

Date of the report; not a start date.

A first-person announcement. The stated reason is Brundage's own wording; the post gives further considerations (more time on issues across the industry, freedom to publish, independence), which are not separately recorded.

Date of the post. The post says he remains at OpenAI “until the end of day this Friday”; the last working day is not recorded.

A first-person announcement; the note she shared with her team was posted as an image and is not used. Her later movements are recorded separately.

Date of the post (UTC); not a last working day.

A first-person post; it names no title or role and does not give the date of his return. His post of August 2024 announcing a sabbatical is not recorded (no predicate records a leave; maintainer decision of 2026-10-30) and is not a premise of this record.

Date of the post; the post does not give the date of his return.

A first-person post that reproduces the message she shared with colleagues. It gives no title and does not say which team she was on when she left; she names the Policy Research team as one she moved to earlier. Reporting that she led a Policy Frontiers team was not checked against a primary source and is not recorded.

Date of the post; the post says the preceding week was her last at OpenAI. The last working day is not recorded.

The record rests on reporting of an OpenAI press release that was not retrieved. The quotations are from heise online’s English edition, which the page says was originally published in German and translated with technical assistance and editorially reviewed. No OpenAI title or start date is given.

Date of the report; not a start date.

The record rests on reporting of an OpenAI press release that was not retrieved. The quotations are from heise online’s English edition, which the page says was originally published in German and translated with technical assistance and editorially reviewed. No OpenAI title or start date is given.

Date of the report; not a start date.

The record rests on reporting of an OpenAI press release that was not retrieved. The quotations are from heise online’s English edition, which the page says was originally published in German and translated with technical assistance and editorially reviewed. No OpenAI title or start date is given.

Date of the report; not a start date.

The post establishes the announcement; the role left is taken from TechCrunch’s report of the same day (reporting). The post as retrieved is truncated and does not give a last working day; the record does not establish the terms of any later partnership with OpenAI.

Date of the X post (20:59 UTC); not a last working day.

The announcement does not give an exact start date or establish a continuing role.

Announcement date. Publication date from OpenAI’s own news feed (openai.com/news/rss.xml, retrieved 2026-10-15); the reader-relay text does not carry it.

The announcement gives no start date. OpenAI announced Arvind KC as Chief People Officer on 24 February 2026; no end date for Villagra is recorded here.

Announcement date. Publication date from OpenAI’s own news feed (openai.com/news/rss.xml, retrieved 2026-10-15); the reader-relay text does not carry it.

The record rests on reporting in an independent journalist's newsletter (Obsolete), which relays a LinkedIn post that was not retrieved and a statement by an OpenAI spokesperson. Candela remained at OpenAI in another role; this records leaving the Preparedness role, not the company. Engadget later dated his move away from Preparedness to July 2025; the earlier report is used here.

Date of the LinkedIn announcement as given by the report (“posted yesterday”); the report says the step-down itself took place weeks earlier.

A conference biography published by a Singapore government agency, not an OpenAI document. WIRED reported in July 2026 that he took over as head of safety systems in 2024, after Lilian Weng left; no OpenAI announcement of the appointment was retrieved.

Conference date shown on the page; the page's own publication date is not shown. Not a start date.

An announced appointment: the message says she would transition from Instacart over the next few months and join later in the year. Altman stated that he remained CEO of OpenAI.

Announcement date. Publication date from OpenAI’s own news feed (openai.com/news/rss.xml, retrieved 2026-10-15); the reader-relay text does not carry it.

A first-person post, the first of a thread; later posts in the thread were not retrieved. It does not establish a start date or how long he held the role. Engadget (27 December 2025) dates his move from Preparedness to recruiting to July 2025, which conflicts with this post's date; the earlier report of his step-down is recorded separately.

Date of the post (UTC). Not a start date.

The record rests on retrospective reporting. His later title of CTO of Compute (reported in July 2026) is recorded separately.

Start month as reported ('last July' in a July 2026 report); the report records a later change of title, so no end of this title is inferred or extended.

The source states that Ive and LoveFrom remain independent; the record does not establish employment or a title.

Date of the update on the announcement page.

An announced appointment tied to the acquisition; no start date is established.

Announcement date. Publication date from OpenAI’s own news feed (openai.com/news/rss.xml, retrieved 2026-10-15); the reader-relay text does not carry it.

A dated title on a document; it does not establish when the role began.

Title as shown on the announcement of that date. Publication date from OpenAI’s own news feed (openai.com/news/rss.xml, retrieved 2026-10-15); the reader-relay text does not carry it.

The record rests on reporting of a spokesperson's confirmation; no OpenAI announcement was retrieved. It does not establish a continuing role.

Date of the report, which gives the appointment as effective that Tuesday.

The post names him by his X handle; the identification with Sachin Katti rests on reporting (Tom’s Hardware, which follows Reuters). No title is given. His move from Intel is not recorded here.

Date of the post; not a start date.

An announced appointment; no start date is given.

Announcement date. Publication date from OpenAI’s own news feed (openai.com/news/rss.xml, retrieved 2026-10-15); the reader-relay text does not carry it.

His own note, shared as an image, announces the departure and gives no last day; the image was read visually, not machine-matched. His title rests on TrendForce’s report. The reason is recorded in his own words from the note.

Date of Tworek's X post (UTC), which shares a note to his team as an image; the report is dated 7 January 2026. No leaving date is given.

An announced return; the post does not state a title or start date, nor a date of Metz’s departure from Thinking Machines Lab.

Post dated 2026-01-15 00:11 UTC (14 January in US Pacific time); an announcement date, not a start date.

An announced return; the post does not state a title or start date.

Post dated 2026-01-15 00:11 UTC (14 January in US Pacific time); an announcement date, not a start date.

An announced return; the post gives no title or start date and does not name his previous organisation. Records for Zoph and Metz from the same post are in the dataset.

Post dated 2026-01-15 00:11 UTC (14 January in US Pacific time); an announcement date, not a start date.

An announced appointment; neither post gives a start date. Scandinaro’s post refers to his time at Anthropic without naming a role there.

Date of both posts; not a start date.

An OpenAI publication carrying a first-person note. It does not establish a start date or the role's reporting line.

Date of the newsletter issue. Not a start date.

An announced hire; neither text names a title or start date. Steinberger writes that OpenClaw will move to a foundation; that arrangement is not recorded here.

Date of Altman's post; Steinberger's post is dated 14 February 2026. Not a start date.

An announced appointment; no start date is given.

Announcement date. Publication date from OpenAI’s own news feed (openai.com/news/rss.xml, retrieved 2026-10-15); the reader-relay text does not carry it.

A first-person announcement that gives no last day. His note says he led post-training for about a year (cross-family check, which read the full note on X); it does not give the title Vice President of Research, which rests on reporting (exchange4media, 5 March 2026).

Date of the post; no leaving date is given.

A first-person announcement. The organisational change he mentions is his statement, not independently checked.

Date of the post; he describes it as his last day.

An announced move in his own post; it gives no title or start date.

Post time 2026-06-18 00:15 UTC (17 June in US time zones); not a start date.

An announced appointment in a first-person post; the record does not establish that the role began or continues.

Date of the post; the post gives 6 July (2026) as the joining date, a stated plan, not a confirmed start.

The record rests on reporting (WIRED, which relays a memo by Mark Chen it had seen); no post by Heidecke or announcement by OpenAI was retrieved. No reason is recorded.

WIRED's report of 10 July 2026 says he told staff “this week”; the exact day and the last working day are not given.

The record rests on reporting (WIRED, citing a note to staff it obtained); no post by Achiam or announcement by OpenAI was retrieved. WIRED relays from the note his own account of the decision; because the note itself was not retrieved, no reason is recorded.

WIRED's report of 7 July 2026 (a Tuesday) says he notified colleagues “on Tuesday”; the last working day is not given.

A first-person announcement of leaving a full-time role while continuing as a part-time advisor; it is not an end to every association.

Date of the post; not a last working day.

The record rests on reporting (WIRED, relaying an internal memo it had seen). It does not establish when Glaese took up either title. The title wording may be WIRED's rather than the memo's.

Date of the report. Not a start date.

The record rests on reporting (WIRED, relaying an internal memo it had seen); no OpenAI announcement was retrieved. An announced reorganisation; its implementation is not established.

Date of the report of an announced change; not a start date.

The record rests on reporting (WIRED, relaying an internal memo it had seen). The record does not establish a start date or a permanent appointment.

Date of the report of an announced change; not a start date.

The 18 July 2026 snapshot rests on an unsourced trade people-movement brief (exchange4media); no OpenAI announcement was found. CNBC reported on 14 October 2026, in a sentence attributed to an OpenAI spokesperson, that he had been serving as CTO of compute; that later report supports the title, not the July date.

Date of the report; the date of the change is not given.

The record rests on reporting: TechCrunch relaying an OpenAI spokesperson. No OpenAI announcement was retrieved. It does not establish a start date, a formal title or a continuing role.

Publication date of the report; not a start date.

An announced future departure after a transition period; the last working day is not established.

Announcement date. Publication date from OpenAI’s own news feed (openai.com/news/rss.xml, retrieved 2026-10-15); the reader-relay text does not carry it. Not a last working day.

An announced appointment; no start date is given.

Announcement date. Publication date from OpenAI’s own news feed (openai.com/news/rss.xml, retrieved 2026-10-15); the reader-relay text does not carry it.

An announced departure; the last day was scheduled at the time of recording, and its completion is not documented. His title rests on CNBC. His plan to build something new is not recorded as a reason.

Date of his post and of the report. The last day of 15 November 2026 was still to come when the record was made.

The record rests on reporting (CNBC) of a company spokesperson’s statement; it does not establish a title for the new remit or that the handover took place.

Date of the report; the handover is prospective (Katti's reported leaving date is 15 November 2026).

No start/end dates, duration, or precise job title are supplied. No departure event is inferred.

The source establishes a prior role but does not supply employment dates. No start or end is inferred.

A project leadership role, not an assertion that he led all OpenAI engineering. Dates are unspecified.

The source establishes a prior role but does not supply employment dates. No start or end is inferred.

Retrospective biography; the source-access date does not date the role.

The source establishes a prior role but does not supply employment dates. No start or end is inferred.

The slide’s title is retained as “VP of Safety”; no additional policy remit or tenure dates are inferred.

The source establishes a prior role but does not supply employment dates. No start or end is inferred.

The undated page is historical evidence of a role, not evidence he still works there. Later SSI records do not supply exact OpenAI departure dates.

Undated page retains present-tense OpenAI wording; no current appointment is inferred.

Anthropic's description of a prior role; no dates, title history or departure date are established.

The slide does not date the role.

Anthropic's description of a prior role; no dates are established. The existing record of his 2020 OpenAI affiliation is a separate proposition.

The slide does not date the role.

First-person retrospective; it gives no formal title or dates, and no OpenAI source was retrieved. The GPT-2 and GPT-3 names do not date the role.

Retrospective self-account (2022-04-26); the dates of the role are not stated and stay unknown.

A first-person retrospective account. It does not establish when he held the role.

The post gives no dates for the role; it precedes his role as Senior Advisor for AGI Readiness.

A retrospective mention. It does not establish when she held the role, when it ended or her earlier policy roles at OpenAI.

The update gives no dates for the role; it precedes her announced Foundation role.

A retrospective self-description. OpenAI’s 2015 launch announcement names Brockman as CTO (existing record); the post does not establish a legal founder status.

The post gives no founding date; “9 years ago” in a post of August 2024 is the author’s approximation and is not converted into a date here.

A company statement of a founder’s earlier role; it gives no start or end date. The post gives first names only; the full name Linden Li rests on TechCrunch, which reports the founders’ names as reported by Upstarts Media.

Prior role stated retrospectively in a 29 October 2025 post; no dates are given.

A company statement of a founder’s earlier role; it gives no start or end date. The post gives first names only; the full name Rhythm Garg rests on TechCrunch, which reports the founders’ names as reported by Upstarts Media.

Prior role stated retrospectively in a 29 October 2025 post; no dates are given.

A company statement of a founder’s earlier role; it gives no start or end date. The post gives first names only; the full name Yash Patil rests on TechCrunch, which reports the founders’ names as reported by Upstarts Media.

Prior role stated retrospectively in a 29 October 2025 post; no dates are given.

The record rests on reporting (The Decoder), which names no source; it does not establish dates, a title or the end of her OpenAI role.

The report gives a duration of three years but no dates.

First-person retrospective; title is a description of research responsibility, not an inferred corporate rank.

The source establishes a prior role but does not supply employment dates. No start or end is inferred.

The source’s since-2017 research history does not date his Director of Research appointment.

Previous role stated by a dated source; the director tenure is not dated.