Y Combinator co-founder, Michael Seibel announced late Wednesday on X that he is transitioning to a “partner emeritus” role, marking the end of his 12-year tenure at the renowned startup accelerator.
Y Combinator CEO Garry Tan confirmed the news in a company blog post, reflecting on Seibel’s deep ties with YC. Seibel first joined the program as a founder, participating twice—first with Justin.TV, the streaming startup that later became Twitch, and later Socialcam, a mobile video-sharing app. He went on to serve in several leadership roles at YC, including group partner, managing director, and CEO of the accelerator.
Seibel had already begun stepping back in recent months. In a 2023 YC blog post, he announced plans to hand over his leadership responsibilities, with the transition becoming fully effective after YC’s Winter 2024 batch completed the program.