His research interests encompass electrophysiology and cell pathophysiology of pulmonary (airways and alveoli) and ocular (conjunctiva) epithelial barriers. He has been studying the active/passive barrier properties of respiratory epithelia utilizing amphibian lungs, isolated perfused rat lungs, and alveolar /airway epithelial cells in primary culture. Transport cell physiology of various epithelial barriers has been studied in his laboratories utilizing Ussing chamber techniques and other approaches (e.g., confocal laser scanning microscopy and electron microscopy, short-circuiting techniques, patch clamping techniques, impedance analysis, permselectivity assessment of paracellular pathways using dilution and bi-ionic potential measurements, equivalent pore/slit analysis, water transport estimations using capacitance probes, and western/northern analyses).