The Open Grid Services Architecture (OGSA) is a standards based foundation for building service based Grid infrastructure and applications. OGSA provides a uniform foundation on which robust and scalable Grid services can be constructed. Because of these advantages, the newest version of the Globus Toolkit (RM), is based on OGSA, making GT3 an open source reference implementation of the Open Grid Services Infrastructure (OGSI) core behaviors, as well as fundamental Grid functionality. In this two talks, I will give an overview of OGSA and describe its implementation in GT3. I will also outline current directions in both OGSA, and the development of the Globus toolkit.