Openai's Safety Chief Departs Amid Team Restructuring

WHO:

CNBC - Greg Brockman is now officially responsible for OpenAI's most important and profitable projects after Fidji Simo stepped down due to chronic illness.

CNBC - Fidji Simo served as OpenAI's product and business chief for about a year.

Techmeme - Johannes Heidecke, head of safety at OpenAI, is leaving the company.

Techmeme - Mia Glaese will become the Vice President of research and safety at OpenAI.

WHAT:

CNBC - Greg Brockman will oversee OpenAI's ChatGPT product business, go-to-market teams, enterprise teams, and compute initiatives.

CNBC - OpenAI confidentially filed its prospectus with regulators in June for a prospective IPO, but has not disclosed when it plans to debut and is reportedly delaying until next year.

CNBC - ChatGPT's market share fell below 50% for the first time in March, according to a report from Sensor Tower.

Techmeme - Johannes Heidecke's departure is part of OpenAI's effort to integrate its research and safety teams.

Wired - OpenAI is trying to further integrate its research and safety teams.

WHY:

CNBC - Brockman is under pressure to bring in revenue and justify OpenAI's $852 billion valuation, especially as the company gears up for its IPO.

Techmeme - The integration of research and safety teams is a strategic move by OpenAI.

HOW:

CNBC - Brockman took over product responsibilities during Simo's absence and will continue to lead those efforts.

(UPDATED July 11, 2026 04:03 UTC)

Greg Brockman is now officially in charge of OpenAI's most important and profitable projects, taking over from Fidji Simo, who stepped down due to chronic illness after serving as the company's product and business chief for about a year. In his new role, Brockman will oversee key areas including OpenAI's ChatGPT product business and enterprise teams, all while the company prepares for a potential IPO, which has been delayed until next year. With ChatGPT's market share dipping below 50% for the first time in March, Brockman faces the challenge of generating revenue to support OpenAI's $852 billion valuation.

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(UPDATED July 11, 2026 02:53 UTC)

In a significant leadership change at OpenAI, Johannes Heidecke, the head of safety, is leaving the company as part of a strategic effort to integrate its research and safety teams. Mia Glaese will step in as the new Vice President of research and safety, taking on this crucial role in the organization. This move reflects OpenAI's commitment to enhancing collaboration between its research and safety divisions.