John Giannini, PhD

John Giannini serves as Branch Chief of the Data Systems Branch at the All of Us Research Program, where he leads strategy for expanding high-value research data, including medical imaging and electronic health record resources. Trained as a physicist and optical engineer, he brings expertise in fluorescence microscopy, retinal imaging, and quantitative image analysis from doctoral and postdoctoral research. At All of Us, he advances data quality frameworks and guides acquisition planning for new imaging and linked data types that strengthen the program’s utility for researchers. His work focuses on building scalable data infrastructure to support diverse, data-driven biomedical discovery.