Jeffrey is a research professor at Case Western Reserve University and an applied geostatistician specializing in geospatio-temporal modeling for subsurface and environmental applications. He integrates geostatistics, machine learning, and high-performance computing to analyze reservoir quality, nutrient flow, and spatial uncertainty. Prior to joining Case, he spent 47 years in the petroleum industry, retiring as a Senior Technology Fellow at Halliburton. Today his work focuses on refining geostatistical workflows for large-scale modeling and prediction in environmental and petroleum systems.