Michael Seibel announced late Wednesday on X that after more than 12 years at the famed accelerator Y Combinator, he is transitioning to a “partner emeritus” role. Y Combinator CEO Garry Tan shared the news separately in a company blog post, highlighting Seibel’s long history with the outfit. Seibel first joined YC as a founder, going through the program twice — once with the streaming startup Justin.TV and later with the streaming app Socialcam. Seibel later served as a group partner, managing ...