Our research group applies precision light sources from across the electromagnetic spectrum to probe and control the structure and dynamics of complex molecular systems. We specialize in infrared frequency comb and cavity Fourier transfrom microwave spectroscopies, which are ideally suited to studying molecular vibrational, rotational, and spin degrees of freedom at the individual quantum-state level. We combine these light-matter probes with reactive molecule sources and advanced cooling techniques, including supersonic expansion and cryogenic buffer gas cooling, to reveal insights into often elusive and exotic molecules. Our experimental work is often supported by sophisticated quantum chemical theoretical methods developed in-house. This joint approach grounded in precision spectroscopy of complex molecular matter enables us to solve problems in a wide range of fields including quantum measurement science, ultracold molecules, atmospheric chemistry, astrochemistry, molecular magnetism, and fundamental physics.