Greek-American Peter Sellis Takes Over Product at Musk’s X

27 Oct 2026, 22:28 by Bill Giannopoulos · Greek City Times

Greek-American tech executive Peter Sellis has joined X to lead product, taking over from Nikita Bier at Elon Musk’s social media platform after a career at Snap, Discord and Microsoft.

Peter Sellis announces on X that he is joining the platform to lead product. Photo: Peter Sellis/X

Sellis announced the move in a post on X on Monday. “I’m joining the team at @X to lead Product,” he wrote.

He also said he is “a huge believer” in the mission of Musk’s SpaceX.

According to The Verge, Sellis replaces Bier after his one-year stint in the role.

Bier announced in August that he would step down, Business Today reported. However, he will stay on for a time as an adviser.

Musk also thanked him publicly on X.

“Thanks for helping make this platform much better! You will be missed,” he wrote.

Who is Peter Sellis?

Peter Sellis has spent more than 15 years building consumer apps.

He was head of product at the streaming company Ustream from 2009 to 2012. After that, Sellis worked at the venture studio Science Inc.

In 2015, he joined Snap, where he spent seven years and rose to vice president of product.

According to Business Today, he built the revenue product team that grew into a business worth more than US$4 billion.

Later, he became senior vice president of product at Discord. Before joining X, he served briefly as a corporate vice president at Microsoft AI.

What Peter Sellis plans for X

In his post, Sellis said X is “the best way to find out what’s happening in the world right now and talk about it”.

He said his goal is to speed up the platform’s recent momentum for users and businesses. In addition, he wants to make the product “beautiful and useful”.

Still, X has not yet said what his appointment will mean for users, Business Today noted.

Finally, Sellis ended with a joke for his new audience. “I’m sure the replies will be measured and magnanimous,” he wrote.

By Tuesday, the post had drawn more than two million views and over 2,500 replies.

Musk’s wider tech empire has been busy too. For instance, Musk’s Grok AI released its first ‘Odyssey’ episode, and Musk has also shared Marco Rubio’s Pnyx speech with his followers.

The move comes weeks after Prime Minister Kyriakos Mitsotakis headed to Silicon Valley to court tech investment for Greece.

In short, Sellis now holds one of the most visible product jobs in tech, at the helm of X.

Source: The Verge

Stay connected to Greek City Times for Free on Google News
Click NOW
Stay updated with the latest news from Greece and around the world on greekcitytimes.com.
Contact our newsroom to share your updates, stories, photos, or videos. Follow GCT on WhatsApp, Google News and Apple News.

Related coverage

Advertising