Develops superconducting detector and readout systems for CMB observations. Directions: (1) SQUID-multiplexed readout architecture for large TES bolometer arrays (SPT-3G, CMB-S4); (2) transition-edge sensor bolometer fabrication and characterization; (3) MKID detector development; (4) CMB-S4 instrument design. Argonne joint appointment. Deep expertise in quantum-limited cryogenic detector readout.