Peter Sellis
Peter Sellis is a technology product executive. He was SnapchatSnapchatA visual messaging and social app developed by Snap Inc., launched in 2011, with photo and video messaging, Stories, augmented-reality Lenses, Snap Map and Spotlight.Open the full entry’s first product manager, rose to vice president of product at Snap and became senior vice president of product at Discord in 2022. After a brief stint at MicrosoftMicrosoftMicrosoft is a technology company founded by Bill Gates and Paul Allen in 1975 and headquartered in Redmond, Washington, with businesses spanning Windows, Microsoft 365, Azure, enterprise software, artificial intelligence, gaming and devices.Open the full entry AI in 2026, he announced in October 2026 that he was joining X to lead product.
Contents7 sections
Key facts
2006–2015Early Career
Sellis worked as an analyst at L.E.K. Consulting from 2006 to 2009, served as head of product at Ustream from 2009 to 2012 and worked at Science from 2012 to 2015.[1]
Sellis is Greek-American. Ustream was a streaming company, and Science Inc. is a venture studio.[2]
2015–2022Vice President of Product at Snap
Sellis was Snapchat’s first product manager and spent seven years at the company.[3]
His tenure at Snap ran from 2015 to 2022, and his title was vice president of product.[1]
2022–2026Senior Vice President of Product at Discord
Sellis served as senior vice president of product at Discord.[4]
He joined Discord in 2022; his projects there included sponsored Quests for game developers and a redesigned in-game Overlay.[1]
June 2026Joining Microsoft
In June 2026 Microsoft was bringing Sellis on board to lead Copilot design, growth and engineering, reporting to Copilot executive vice president Jacob Andreou, another former Snap executive.[5]
He went on to serve as a corporate vice president at Microsoft AI.[4]
September 2026Lenny’s Podcast Interview
On September 20, 2026, Lenny’s Podcast released a long interview with Sellis covering team design, his experience managing Nikita BierNikita BierNikita Bier is an American entrepreneur and product manager known for developing tbh and Gas, anonymous compliment-polling apps for teenagers, which were acquired by Facebook, Inc. (now Meta) and Discord in 2017 and 2023, respectively. He announced on June 30, 2025, that he had become head of product at the social media platform X, stepped down in August 2026, and said in October of that year that he had officially left X.Open the full entry, why Snapchat’s ads business never reached its potential and why growth almost always comes from the core product.[3]
October 2026Head of Product at X
On October 26, 2026, Sellis announced on X that he was joining the company to lead product, writing, “I’m joining the team at @X to lead Product.” He said his goal was to accelerate X’s momentum for its community, new users and businesses globally by continuing to make the product “beautiful and useful.”[6]
He succeeded Nikita Bier, who had announced he would step down after more than a year in the role.[4]
By October 27 the post had drawn more than two million views and over 2,500 replies.[2]
Sources
- Peter Sellis — Your favorite product guy's favorite product guy. (opens in a new window)
- Greek-American Peter Sellis Takes Over Product at Musk’s X (opens in a new window)
- 90 minutes of unfiltered product advice from Snap and Discord’s product chief | Peter Sellis (opens in a new window)
- Ex-Microsoft AI executive Peter Sellis takes over as X product chief: All details (opens in a new window)
- Mary Jo Foley: What’s a consumer-focused outsider doing at the helm of Microsoft’s AI push? (opens in a new window)
- Peter Sellis on X: “I’m joining the team at @X to lead Product. …” / X (opens in a new window)