This document discusses the International Standard Name Identifier (ISNI), a global standard for public identification of parties associated with creative works and activities. It provides a brief history of ISNI, describing its development from an idea proposed over 30 years ago to its current implementation as an international standard (ISO 27729) managed by the ISNI International Agency. The document outlines ISNI's role in bridging identities across domains for writers, artists and other creators. It also summarizes how libraries can utilize and contribute to ISNI through their involvement in the VIAF project and becoming a Registration Agency or ISNI member.