Professor Gasiewski is an internationally-recognized expert in passive and active remote sensing of atmospheric, land surface, cryospheric and oceanographic processes, and contributor to several related underlying disciplines, including electromagnetic wave propagation, scattering, and radiative transfer theory and applications, signal detection, estimation, and model-based data assimilation, microwave instrumentation, radio spectrum allocation, and sensor calibration and metrology. He is engaged in the development of surface-based, airborne, and spaceborne remote and in situ sensing systems for meteorology, hydrology, climatology and related environmental applications. His specific interests include the development of UAS-based systems for Earth observation and precision agriculture, and low-Earth orbiting constellations of passive microwave imaging satellites for improved mesoscale weather forecasting. He has interests in radar systems for glacial ice imaging and aircraft navigation, wave propagation in turbulent media, environmental sensor systems for renewable energy development, and systems for sensing electrical phenomena in the atmosphere. His remote sensing interests include the development of radar imaging systems for subsurface imaging of the ice sheets on Europa and Enceladus.