Partner Emeritus Y Combinator
Y Combinator's first Black partner (2014), former Managing Director and CEO (2016-2024), now Partner Emeritus. Co-founded Justin.tv which became Twitch. Board member at Reddit and Dropbox. Known for significantly increasing diversity at YC.
As YC's Managing Director, Seibel led efforts to significantly increase diversity among YC-funded startups. Under his leadership from 2014-2024, YC funded over 500 female founders, 200+ Black founders, and approximately 300 Latine founders. He stated 'You change the stats by funding people.'
Seibel was appointed to the Reddit board of directors in June 2020, replacing co-founder Alexis Ohanian who resigned following the murder of George Floyd and explicitly requested that a Black candidate fill his seat. Reddit cited Seibel as a 'longtime advocate of diversity and inclusion in the startup world.'