Kaan Sirin is the Co-founder and CEO of Ossus, a cultural intelligence company. Ossus began with libraries after seeing that the institutions that help people learn, discover, and make sense of the world have been underserved by technology. This became Librar, Ossus’s first product. Ossus is building toward a future where knowledge is more connected, more useful, and easier for people and AI to build on. Ossus was part of Y Combinator’s Winter 2026 batch and raised a $6M seed round led by Norrsken.