Michael Seibel.

Michael Seibel is a Managing Director at Y Combinator, where he has been a partner since 2013, and one of the most influential Black leaders in Silicon Valley.

Seibel co-founded Justin.tv in 2007 with Justin Kan, Emmett Shear, and Kyle Vogt-which later pivoted to become Twitch, the live-streaming platform acquired by Amazon for $970 million. He also co-founded Socialcam, a mobile video company acquired by Autodesk for $60 million in 2012. At Y Combinator, Seibel served as CEO of the core accelerator program from 2016 to 2023, overseeing thousands of funded companies during a period of explosive growth. He is a prolific advocate for underrepresented founders, speaking publicly about the challenges of being a Black founder in Silicon Valley and working to expand access to startup funding and mentorship. Seibel's perspective-combining experience as a founder of successful exits with leadership at the most influential startup accelerator in the world-makes him one of the most respected mentors in the technology ecosystem. His work has directly shaped the trajectory of thousands of companies and helped establish pathways for diverse founders in technology entrepreneurship.