After more than a decade at Y Combinator (YC), Michael Seibel, one of the most influential figures in the global startup ecosystem, is stepping down from his active role. Seibel announced his transition to Partner Emeritus, a role that allows him to continue advising startups he has worked with but removes him from day-to-day operations and funding new YC companies. His departure marks a significant moment for YC and the many founders he has mentored, particularly in Africa and the Middle East.
More than a Decade of Impact at YC
Seibel joined Y Combinator in 2013 and became one of its most prominent leaders. Over his 12+ years tenure, he played multiple roles, including Group Partner, Managing Director, and CEO of YC’s accelerator program. His influence at YC is undeniable:
- He has worked with 1,745+ companies across 21 batches.
- Conducted 6,500+ office hours with startups.
- Read over 17,000 applications and participated in 3,100+ interviews.
- Advised over 50 companies now worth more than $500 million, including Brex, Rippling, Bird, Apollo.io, Opentrons, Supabase, and Instawork.
- The companies he has worked with are now valued at $192 billion combined.
Seibel’s presence at YC extended beyond Silicon Valley. He was a key advocate for African and Middle Eastern startups, helping many of them secure funding, refine their business models, and scale globally.
A Founder Before Becoming an Investor
Before joining YC as a partner, Michael Seibel was a YC founder himself. He co-founded Justin.tv, which later evolved into Twitch, acquired by Amazon for $970 million in 2014. He also co-founded Socialcam, a mobile video-sharing platform, which was sold to Autodesk for $60 million in 2012. His deep experience as a founder made him an invaluable mentor to startups, offering practical advice based on real-world challenges.
Why He Is Stepping Down
On March 20, 2025, Seibel posted on X (formerly Twitter) that he would be transitioning to Partner Emeritus, allowing him to continue advising over 1,000 startups he has worked with in the past decade.
“The next adventure I’m excited to pursue (after taking the summer to relax) is how I can help government better serve its citizens, government was the passion of my youth and I’m excited to reengage.” He wrote.
Seibel’s interest in public service isn’t new. Before his startup career, he worked as a finance director for a U.S. Senate campaign. His departure signals a shift toward civic engagement, although he hasn’t revealed specific plans yet.
What This Means for Y Combinator
While Seibel will no longer be involved in funding new YC startups, he will remain a resource for founders through office hours and mentorship. YC CEO Garry Tan acknowledged Seibel’s contributions, stating,
“He has been instrumental in shaping our program, our culture, and our values.”
His departure comes at a time when YC is changing, including a greater focus on AI startups. At YC’s Winter 2025 Demo Day, it was revealed that over 95% of the codebase for some funded startups was AI-generated, highlighting YC’s shift towards AI-first companies.
Seibel’s Legacy in Africa and the Middle East
Seibel was instrumental in expanding YC’s reach into Africa and the Middle East. He ensured that more startups from these regions gained access to Silicon Valley resources and investors.
During his time at YC, he played a key role in increasing diversity in the accelerator. Since 2015, YC has funded:
- 500+ female founders
- 200+ Black founders
- 300+ Latine founders
His support helped many African startups grow, raising millions in follow-on funding and expanding globally. His departure leaves a gap, and many founders in these regions are now wondering what YC’s future focus will be.
What Comes Next?
Seibel’s departure from active investing at YC raises questions about who will step up to continue his work with African and Middle Eastern startups. While YC has other partners, none have publicly taken on Seibel’s role in championing startups from these regions.
However, Seibel remains a mentor and advisor. His move into public service could open new opportunities for startups working on government-focused solutions, bridging the gap between tech and policy.
Michael Seibel’s exit from day-to-day operations at YC marks the end of an era. He leaves behind a legacy of startup mentorship, diversity, and global inclusion. His next chapter in government innovation could redefine how startups and policymakers collaborate.
For YC founders, particularly in Africa and the Middle East, his absence will be felt. However, his influence remains embedded in the thousands of companies he has mentored and the entrepreneurs he has inspired
