The Open Science Grid

The Open Science Grid is a consortium of universities and national laboratories that supports scientific computing via an open collaboration of science researchers, software developers and resource providers. Applications from a variety of disciplines are supported on the OSG including HEP applications from LHC experiments Atlas and CMS, run II and other collaborations. In this talk I will describe the Open Science Grid, its organization, its operation and how we build and maintain one of the largest distributed computing infrastructures in the world.