Greg Brockman

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Co-founder and President of OpenAI — the engineer and builder who assembled the founding team, served as the company’s first CTO, and has led its infrastructure expansion as the architect of the Stargate compute buildout.

Profile

Field Detail
Born November 29, 1987, Thompson, North Dakota, USA
Nationality American
Current Institution OpenAI (Co-founder & President)
Role Focus AI Infrastructure, Compute Strategy, Product Development
Education Harvard University (left after one year); MIT (dropped out, 2010)
Personal Website gregbrockman.com
Blog blog.gregbrockman.com
X / Twitter @gdb
GitHub @gdb

Overview

Greg Brockman is an American entrepreneur and software engineer who co-founded OpenAI in December 2015 and has served as its President since 2022. Where other OpenAI co-founders are primarily recognized for research contributions, Brockman’s role has been organizational and operational: he recruited the founding team — including Ilya Sutskever, whose departure from DeepMind was seen as a decisive signal of OpenAI’s seriousness — built the company’s early engineering infrastructure, led product efforts including OpenAI Gym and the OpenAI Five Dota 2 system, and delivered the live GPT-4 demo in 2023 that launched the current era of frontier model competition. Before OpenAI, he was the first CTO of Stripe, where he served from 2010 to 2015 and oversaw the company’s growth from 5 to 205 employees. Since returning from a sabbatical in November 2024, Brockman has taken on the central operational role in OpenAI’s Stargate infrastructure program — a commitment to spend $1.4 trillion on AI compute infrastructure — earning the informal designation “builder-in-chief.”

Early Life & Education

Brockman grew up in Thompson, North Dakota, and attended Red River High School in Grand Forks, where he excelled across mathematics, chemistry, and computer science. His early academic record was exceptional by regional and national standards: he won a silver medal at the 2006 International Chemistry Olympiad, became the first finalist from North Dakota in the Intel Science Talent Search since 1973, and attended Canada/USA Mathcamp in 2003, 2005, and 2007 — a selective summer program for mathematically talented high school students. He has written that he first became interested in AI as a teenager, after reading Alan Turing’s “Computing Machinery and Intelligence” and attempting to build a chatbot, an experience that left him convinced the field lacked the techniques to make language truly work — a problem he would eventually return to at OpenAI.

Harvard University (2008–2009, left)
Brockman enrolled at Harvard in 2008 but left after approximately one year, drawn by the opportunity to work at an early-stage technology company.

MIT (briefly, 2009–2010, dropped out)
He briefly enrolled at MIT before leaving in 2010 to join Stripe, a company being founded by his MIT classmate Patrick Collison and Patrick’s brother John Collison.

Career

Stripe — Early Employee and CTO (2010–2015)

Brockman was among the earliest employees of Stripe, the payments infrastructure company founded by Patrick and John Collison in 2010. He joined as a founding team member shortly before the product launched, taking on whatever engineering and operational work the company needed. In 2013, he became Stripe’s first CTO, a role in which he oversaw the company’s engineering organization as it scaled from 5 to 205 employees over two years. By the time he left in May 2015, Stripe was valued at $3.5 billion. He has written that his CTO role taught him what it means to “have scalable impact by writing code” — a phrase that captures his foundational preference for building over managing.

His blog post series documenting his thinking about the CTO role — including “#define CTO” and its sequel “#define CTO OpenAI” — became influential documents in startup culture, articulating a vision of technical leadership focused on amplifying others through direct engineering contribution rather than delegation alone.

OpenAI — Co-Founder, CTO, and President (December 2015–present)

Founding (August–December 2015)
OpenAI began as a dinner conversation in August 2015 between Brockman, Sam Altman, Elon Musk, Ilya Sutskever, and a handful of others. After Altman and Musk articulated a vision for building safe AI as a project dedicated to benefiting humanity, Brockman took on the operational task of assembling the founding team. His most consequential recruiting effort was persuading Ilya Sutskever — then a star researcher at Google — to leave and join as OpenAI’s chief scientist. The company was formally incorporated in December 2015 and, as Brockman has noted, initially operated out of his living room.

He co-founded OpenAI alongside Altman, Sutskever, Musk, Wojciech Zaremba, John Schulman, Andrej Karpathy, and others. Brockman served as the company’s first CTO.

OpenAI Gym (2016)
Brockman co-authored and led the development of OpenAI Gym, a Python toolkit providing standardized environments for reinforcement learning research. Released in 2016 as open source, it became the standard benchmark platform for RL algorithms across the field and remains widely used.

OpenAI Five (2018–2019)
Brockman led and championed OpenAI Five, the Dota 2 playing system that became one of the most visible demonstrations of reinforcement learning at scale. He personally introduced the system at its public benchmark events and wrote extensively about what its development revealed about multi-agent learning and the practical challenges of large-scale RL. In April 2019, OpenAI Five defeated OG, the reigning world champions, in a live match — the first time an AI had beaten world-champion esports professionals in a public event.

Self-directed ML transition (2018–2019)
In a widely-read blog post (“How I became a machine learning practitioner,” 2019), Brockman documented his experience transitioning from a systems engineer to an ML practitioner during OpenAI’s first years — noting that the biggest obstacle was not mathematical but psychological: “getting ok with being a beginner again.” The candor about personal skill development was unusual for a company co-founder and resonated broadly.

Promoted to President (May 2022)
Sam Altman formally elevated Brockman to President of OpenAI in May 2022, a role that positioned him as the operational and technical counterpart to Altman’s strategic leadership.

GPT-4 live demo (March 14, 2023)
Brockman delivered the live unveiling of GPT-4 in a demonstration broadcast on March 14, 2023, showcasing its multimodal capabilities including image interpretation, document analysis, and reasoning. The performance — including real-time coding from a hand-drawn sketch — became one of the most-watched product reveals in AI history and established the template for frontier model demonstrations.

November 2023 crisis
On November 17, 2023, the OpenAI board fired Sam Altman as CEO without warning; simultaneously, Brockman was removed from the board and told he would report to interim CEO Mira Murati. Within hours, Brockman resigned in solidarity with Altman, posting on X: “Sam and I are shocked and saddened by what the board did today.” On November 20, Microsoft CEO Satya Nadella announced that both Altman and Brockman would join Microsoft to lead a new advanced AI research team. The following day, after a board-negotiated deal reinstated Altman as CEO, both returned to OpenAI.

Subsequent reporting described the board crisis as partly shaped by concerns about Brockman’s management style within the company; a document submitted to the board by Ilya Sutskever cited alleged bullying, and multiple executives had raised concerns about his relationship with Altman creating structural problems. Brockman’s account, and OpenAI’s official account, described his sabbatical the following year as a personal decision.

Sabbatical (August–November 2024)
In August 2024, Brockman announced a sabbatical — his first sustained break in nine years — saying it was “the first time to relax since co-founding OpenAI.” He returned in November 2024 with a post reading: “Longest vacation of my life complete. Back to building @OpenAI.” His return came as Altman was working with him on a new role focused on significant technical challenges rather than organizational management.

Infrastructure and Stargate (2025–present)
Since returning, Brockman has taken on the role of leading OpenAI’s compute infrastructure strategy — what Fortune (2025) called the position of “builder-in-chief.” The Stargate Project, announced in January 2025, is a joint initiative with SoftBank and others targeting $500 billion in AI infrastructure investment over four years, with an initial commitment of $100 billion. Brockman has overseen major partnership deals including a multiyear agreement with AMD worth tens of billions of dollars covering hundreds of thousands of chips, and has framed his role as building and managing “the chips, data centers, software, and actual operations to deliver intelligence at unprecedented scale.” AMD CEO Lisa Su described Brockman’s contribution as a “maniacal focus on ensuring there’s enough compute in this world.” He has argued publicly that there is “no bend in the scaling laws” and that the primary constraint on AI progress is execution, not fundamental limits.

Codex and product involvement (2025–present)
Brockman has also been closely involved with Codex, OpenAI’s AI coding agent, which appears as the dominant topic in his current public communications. His Digg topic profile reflects this focus: Codex App and Productivity Tools together account for over 58% of his recent posts.

Key Contributions

  • OpenAI founding team assembly — Brockman led the recruiting effort that brought together the founding team, most consequentially persuading Ilya Sutskever to leave Google; the composition of that founding group determined the company’s research trajectory for years.

  • OpenAI Gym — Co-authored and released the standard open-source toolkit for RL benchmarking; shaped the infrastructure for an entire era of RL research.

  • OpenAI Five — Led the multi-year effort to build and publicly demonstrate a world-champion-beating Dota 2 system; the project demonstrated that large-scale RL could produce superhuman performance in complex strategic environments and established a public benchmark for AI capability milestones.

  • GPT-4 live demo — The March 2023 demonstration Brockman personally conducted established the public vocabulary for understanding frontier model capabilities and drove global awareness of the AI transition then underway.

  • Stargate infrastructure leadership — As the operational architect of OpenAI’s $500B+ compute buildout, Brockman is executing the largest private AI infrastructure investment in history — the physical layer on which frontier models will train and serve for the next decade.

  • “#define CTO” essays — Blog posts documenting his evolving understanding of technical leadership became influential reading in the startup community and articulate a philosophy of engineering-led executive contribution that informed OpenAI’s organizational culture.

Awards & Recognition

  • Forbes 30 Under 30 — Enterprise Tech (2017)
  • International Chemistry Olympiad Silver Medal (2006)
  • Intel Science Talent Search Finalist (2007) — First North Dakota finalist since 1973
  • Canada/USA Mathcamp (2003, 2005, 2007) — Selective summer program for mathematically talented students

Key Relationships

  • Sam Altman — OpenAI CEO and Brockman’s closest professional ally since the company’s founding; their political alignment during the November 2023 board crisis — both resigned together and briefly announced a Microsoft move — defined the outcome; they have been described as a unit in the company’s leadership.
  • Ilya Sutskever — Co-founder whom Brockman recruited from Google and who officiated Brockman’s wedding in 2019; Sutskever’s role in the November 2023 board crisis — including submitting documentation of alleged bullying concerns about Brockman — marked a fracture in the relationship; Sutskever subsequently left OpenAI in 2024.
  • Patrick Collison — Stripe founder and Brockman’s MIT classmate; Stripe gave Brockman the operational and engineering experience he carried into OpenAI’s founding.
  • Elon Musk — Co-founder of OpenAI; one of the original dinner-table collaborators in August 2015; now an adversary in litigation (Musk v. Altman et al.), with jury selection in that trial beginning April 27, 2026.
  • Mira Murati — Former OpenAI CTO; in the November 2023 crisis, Brockman was told he would report to Murati, which he rejected by resigning; Murati had previously raised concerns about Brockman’s working style with Altman.
  • AMD CEO Lisa Su — Partner in the Stargate infrastructure buildout; Su has publicly described Brockman’s compute vision as central to a multibillion-dollar partnership.

Personal Style

Brockman’s public persona is organized around a builder identity that he has maintained consistently across roles — at Stripe, at OpenAI, and now in the infrastructure layer of AI. His blog posts are unusually self-disclosing for a company co-founder: he wrote candidly about his years of wanting to become an ML practitioner without making progress, about the psychological barrier of being a beginner as an experienced engineer, and about the specific study habits that eventually worked. This transparency about personal development, combined with his advocacy for engineers in ML research (“great engineers are able to contribute at the same level as great researchers”), reflects a genuine conviction that technical craft, not just research credentials, drives AI progress. His Digg vibe profile — “Hopeful” and “Informing” dominant, “Announcing” significant — reflects a communicator oriented toward possibility and product, and his near-total silence on X when not posting about products (only eight accounts followed) gives his posts an unusual signal-to-noise ratio. The November 2023 crisis and subsequent sabbatical represent a significant biographical interruption: his return in a role focused on infrastructure rather than organizational leadership suggests a deliberate reorientation toward the building activities he finds most energizing.

References