Websites such as the Mathematics Genealogy Project[1][2] or the Chemical Genealogy[3] document academic lineages for specific subject areas, while some other sites, such as Neurotree and Academic Family Tree aim to provide a complete academic genealogy across all fields of academia. However, not all links recorded in such databases are formal advisor-advisee relationships; for instance, the University of Cambridge did not require a formal doctoral thesis until 1919, and academic genealogies that include earlier Cambridge students tend to substitute an equivalent mentor.