Professor Gregoire’s research is directed to the application and development of statistical methods for natural resources and environmental phenomena. One longstanding focus has been on probability sampling techniques and a second focus has been on statistical modeling of longitudinal and spatially correlated data. The results of his research have been published widely in the forestry, ecology, and statistical literature of both subject areas.
Past pursuits include the design and planning of the national forest inventory of Bhutan; the development of estimators of aboveground forest biomass following laser altimetry (LiDAR); and the nature of statistical inference. Professionally, he has been a leader in organizations that promote the use of biometrics and environmental statistics.