Dr. David R. Walt is a member of the faculty at Harvard Medical School in the Department of Pathology at Brigham and Women's Hospital, a core member of the Wyss Institute and a Howard Hughes Medical Institute Professor. Previously, he was university professor at Tufts University. Dr. Walt received a BS in chemistry from the University of Michigan and a PhD in chemical biology from the State University of New York at Stony Brook, NY. His laboratory pioneered the development of microwell arrays (cell-based tests), which resulted in the discovery of bead arrays (genetic tests) that revolutionized the field of genetic analysis. Dr. Walt's laboratory also introduced the idea of digital protein detection by developing a technology for single molecule analysis. Present efforts in his laboratory are aimed at measuring the variation of protein and gene expression in single cells, conducting fundamental studies of populations of single enzyme molecules and single nanoparticles (very small particles) and detecting biomarkers (substances that track disease activity) for cancer and infectious disease. Dr. Walt is the scientific founder of Illumina Inc. and Quanterix Corp and has co-founded several other life science startups. He has received numerous national and international awards and honors for his fundamental and applied work in the field of optical microwell arrays and single molecules. He is a member of the National Academy of Engineering, the National Academy of Medicine, a fellow of the American Academy of Arts and Sciences, a fellow of the American Institute for Medical and Biological Engineering and a fellow of the National Academy of Inventors.