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Joel Greenberg, PhD, is the Founder, President, and CEO of Quadridox, Inc., a company that provides design, development, and analysis services for X-ray sensing and measurement systems. Joel also holds various positions at Duke University, including Faculty at Duke University Medical Physics and Associate Research Professor at Duke University. With a background in physics and engineering, Joel has worked on advanced imaging modalities and techniques for x-ray imaging. Throughout their career, Joel has contributed to research projects, managed technical programs, and taught graduate courses on optics. Joel's expertise extends to areas such as security applications, medical radiography, and contraband detection.