In Six Degrees of Cass Sunstein: Collaboration Networks in Legal Scholarship, we began the study of the legal academy's collaboration network. When mathematicians discuss the nature of collaboration in their field they focus on the most influential collaborator in the discipline-- Paul Erdos, the peripatetic Hungarian mathematician who authored over 1500 papers with over 450 different collaborators before his death in 1996. They introduced the concept of the Erdos Number, which is the number of degrees of separation between a mathematician and Erdos.