This document summarizes the Fourth Global Biodiversity Heritage Library (BHL) Meeting held in Fez, Morocco from May 27-28, 2013. It discusses new partners and content being added to BHL including book viewers, article metadata, and image uploading capabilities. The meeting also covered global replication of data, portal applications, and synchronization of book content between nodes. The Art of Life project was introduced, which describes and provides access to natural history illustrations from BHL.