My research focus and methodologies are rooted in the operating systems research community. My research is experimental in nature, complementing the analytical approaches dominant in many areas of computer science. Experimental systems research blends science with the development skills and creativity needed to convert good ideas into functioning, useful software systems. Its purpose is to develop and refine the fundamental techniques relevant to practical needs in computing systems, implement them in a realistic context, design and conduct experiments to evaluate them, and in many cases, to release system prototypes that serve as a basis for continuing research in the broader community. Experimentation is the ultimate test of the validity and practicality of new ideas, and it is an essential element of technology transfer in computer science. My research since 2001 focuses on managing networked computing and storage “cyberinfrastructure ” as a service utility, in which shared hardware resources are provisioned or sold according to demand, much as electricity is today. This vision rests on several key premises: • An effective environment for dependable computing will combine stateless client devices with a distributed service backbone (data storage, Web services, interaction, computation) whose functions are made scalable and reliable through geographic dispersion and replication [20].