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Calder is the architect of Windows Azure Storage, the file-system layer for the cloud platform. Before joining Microsoft he was a professor at the University of California , San Diego, where he specialized in systems, architecture and compilers. He was the cofounder of three startups: Entropia (distributed comuting), TracePoint (program analysis tools for X86) and Bit-Raker (program-analysis tools for ARM). He also worked as a principal engineer at Digital Equipment Corp.'s Western Research Lab.