This document discusses OpenAthens, a federated access management system. It provides an overview of OpenAthens' history since 1995, its clients in various sectors including academic, commercial, health and government. It then discusses how federated access management works using SAML/Shibboleth to enable access to resources while maintaining user accountability. It also notes how OpenAthens provides identity and discovery services to help institutions and content providers implement federated access management.