Who is new interim OpenAI CEO Emmett Shear? All you need to know about the man replacing Sam Altman
LISBON, PORTUGAL – NOVEMBER 07: LISBON, PORTUGAL – NOVEMBER 07: Emmett Shear, Twitch, on the Contentmakers 1 Stage Stage during day two of Web Summit 2018 at the Altice Arena on November 7, 2018 in Lisbon, Portugal. In 2018, more than 70,000 attendees from over 170 countries will fly to Lisbon for Web Summit, including over 1,500 startups, 1,200 speakers and 2,600 international journalists. (Photo by Eoin Noonan /Web Summit via Getty Images)
Handout | Getty Images News | Getty Images
It’s been just a few days since Sam Altman, the former CEO of OpenAI, was ousted in a shock move — and his replacement has already been named.
After a weekend of rumor and speculation, Emmett Shear — former co-founder and CEO of Twitch — confirmed he will take the top job at probably the most high-profile AI company in the world.
In a post on X early Monday, Shear said he got a call from the company asking him to become interim CEO of the company and that he had accepted, “after consulting with my family and reflecting on it for just a few hours.”
It comes after Altman, who led OpenAI through its development of the wildly popular generative artificial intelligence chatbot ChatGPT, left after facing pressure from the board to step down.
The reasons behind his departure are unclear, but some insiders had expressed concern that Altman wasn’t the right fit for the company. He is involved in another company, the eyeball-scanning tech company Worldcoin, for example, and there were concerns that this may have served as a distraction.
Who is Emmett Shear?
Shear is a big name in Silicon Valley — but to most people, he is unknown.
Shear took Twitch — the live-streaming site he co-founded with Justin Kan, Michael Seibel, and Kyle Vogt in 2007 — from originally broadcasting the life of Kan 24/7, to a worldwide phenomenon.
Twitch was acquired by Amazon for $1 billion in 2014 and Shear stepped down as CEO of Twitch last year.
During his time at the company, he faced tensions from streamers who believed that the platform wasn’t defending their interests. It found itself locked in a tense battle with rival YouTube for talent, with the latter attracting several high-profile personalities from Twitch with lucrative exclusive broadcasting deals.
After Shear’s departure from the streaming site, he became a partner at Y Combinator, the startup accelerator. Altman was formerly president of Y Combinator.
Before Shear started Twitch, he was the co-founder of Kiko Calendar, a calendar app he worked on through the 2005 Y Combinator program.
In his post on X Monday, Shear explained why he had taken the OpenAI job.
“I had recently resigned from my role as CEO of Twitch due to the birth of my now 9 month old son,” Shear said in the post early Monday.
“Spending time with him has been every bit as rewarding as I thought it would be, and I was happily avoiding full time employment.”
“I took this job because I believe that OpenAI is one of the most important companies currently in existence. When the board shared the situation and asked me to take the role, I did not make the decision lightly. Ultimately I felt that I had a duty to help if I could,” he added.
Why it matters
The swift elevation of Shear to OpenAI’s CEO puts him in charge of one of the most important companies in the AI world today.
OpenAI is known for its popular generative AI chatbot, ChatGPT.
The powerful technology behind that chatbot is called a large language model, or LLM. This is an AI model capable of processing and generating human language, based on training from vast amounts of data.
As head of OpenAI, Shear will likely face pressure from regulators who have been heavily scrutinizing AI model companies given the risks the technology poses around misinformation and potential displacement of jobs.
Earlier this month, the U.K. held a pivotal summit on AI safety, attended by major foundational AI companies, to discuss some of the most pressing issues in the field.
Particularly high on the list of discussion areas for world leaders was the “existential risk” that AI poses to humans.
Altman has himself warned of the threat of AI to eradicate humanity, despite being at the helm of a company that was working on rapidly advancing the technology.
Clarification: The headline of this story has been amended to reflect the fact that Shear has been named interim CEO of OpenAI.
Jensen Huang, NVIDIA founder and CEO, has a Q&A session at a press conference during the APEC CEO summit on October 31, 2025 in Gyeongju, South Korea.
Woohae Cho | Getty Images News | Getty Images
Even Nvidia CEO Jensen Huang couldn’t save the tech and artificial intelligence trade this week.
The chip giant’s talismanic leader trumpeted “off the charts” chip sales and dismissed talk of an “AI bubble,” and for a while, the tide lifted all boats.
“There’s been a lot of talk about an AI bubble,” Huang said during an earnings call this week. “From our vantage point, we see something very different.”
The buzz from the blowout report quickly reversed, sending the AI winners deeply into the red — and few beneficiaries were left unscathed.
Every member of the Magnificent 7, except for Alphabet, was tracking for a losing week, with Nvidia, Amazon and Microsoft staring down the biggest losses.
Amazon and Microsoft have led the group’s drop lower, falling about 6% this week. Meanwhile, Alphabet has gained nearly 8%. The search giant is also the only megacap of the group on pace for November gains thanks to a boost from the launch of Gemini 3.
Oracle, which is another major Nvidia customer, slumped about 10%. The chipmaker also supplies major model developers such as OpenAI and Anthropic.
Chip stocks have also declined amid the broader tech market turmoil. Advanced Micro Devices and Micron were on pace for 17% losses. Marvell Technology has slumped about 10%. Quantum computing stocks Rigetti, IonQ and D-Wave have dropped at least 10%
CoreWeave, which buys and rents out Nvidia’s chips in data centers, initially soared on the chipmaker’s earnings report, but swiftly reversed course. The company’s stock is looking at an 8% blow this week.
AI fever was cooling in the runup to Nvidia’s earnings report on Wednesday, and investors looked to the print to alleviate fears that the AI bubble was on shaky ground. Since the launch of ChatGPT in late 2022, the stock has helped power the market to new all-time highs.
But concerns have mounted in recent weeks as tech stocks hit stretched valuations.
Major investors, including Bridgewater’s Ray Dalio told CNBC Thursday that the market is definitely in a bubble.
Much of the worries have stemmed from a boom in capital expenditures spending to support AI, with few signs of a payoff in view for many of the players.
Investor Michael Burry recently accused some of the biggest cloud and infrastructure providers of understating depreciation expenses and estimating a longer life cycle for their chips, calling it “one of the more common frauds of the modern era.”
Earlier this month, Burry revealed bets against Nvidia and Palantir.
Shares of the software analytics company, which supplies AI tools to the government and businesses, are down 11% this week. The stock has shed nearly a quarter of its value this month.
WATCH: Bridgewater founder Ray Dalio: We are definitely in a bubble, but that doesn’t mean you should sell
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