With widespread interest in tracing our family histories, what of our academic family tree - who taught our teachers? Who taught our teachers' teachers? In 1997, mathematician Harry B. Coonce set out to trace his academic ancestry. His database now contains 150,000 names, stretching back to pre- Renaissance Europe. Current director of the Mathematics Genealogy project and LSE researcher Mitchel T. Keller explains how it all works, and what it means to related to genius.