David Walsh is the founder and President of Vista Clara. He is in his 16th year managing this small business in the field of geophysical research and development and instrument manufacturing. His most significant contributions have been in the development and commercialization of: multi-channel surface NMR instrumentation for groundwater investigations, small diameter low-cost borehole and direct-push NMR instruments for hydrological investigations, non-invasive NMR-based soil moisture sensors for geotechnical and agricultural investigations, and nuclear quadrupole resonance-based explosive detection systems.