Mati Staniszewski

Mateusz "Mati" Staniszewski (born 1995¹) is a Polish entrepreneur and a co-founder of ElevenLabs.²

Staniszewski was born in a town outside Warsaw. He moved to the city to go to high school. He finished Copernicus Bilingual High School in Warsaw. He graduated from Imperial College in London with a degree in mathematics.¹³⁴

While in Imperial college, he had his first start-up experience, putting together Mathscon. It was the student led Mathematics conference in the UK, focused on the fun side of math outside university.⁴

He worked at Opera Software, BlackRock, where he joined the Portfolio Analytics Group (PAG) and helped launch the Aladdin Wealth platform, and Palantir Technologies, as a Deployment Strategist, managing large-scale implementation across public and private sectors.³⁵ In 2025 he joined the board of Klarna, a Swedish fintech company.⁶

In May 2022 he and his high school friend Piotr Dabkowski co-founded ElevenLabs, a company that specializes in developing natural-sounding speech synthesis software using deep learning.⁷

Staniszewski serves as the CEO.⁸He raised hundreds of millions of dollars from venture firms including Sequoia, Andreessen Horowitz, Salesforce Ventures. In February 2026, ElevenLabs was valued at $11 billion.⁹¹⁰

Because of its valuation trajectory and the scale of investment it has attached, ElevenLabs is often cited as one of "the Europe's most valuable fastest-growing AI startups", alongside Mistral AI and Lovable, and is considered a significant player in the continent's generative AI ecosystem.¹¹¹²

In 2024, together with his co-founder, he was included in Forbes 30 Under 30 Europe. In December 2025 he was featured on the cover of Forbes.¹³