Professor Gregoire’s research is directed to the application and development of statistical methods for natural resources and environmental phenomena. One focus has been on probability sampling with particular reference to sampling techniques applied to individual trees. 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. He is the coauthor of Sampling Methods for Multiresource Forest Inventory and co-editor of Modeling Longitudinal and Spatially Correlated Data. Recent pursuits include the development of sampling methods to estimate recreation use, the nature of statistical inference, calibration estimators with sample survey data, and sampling with segmented line transects. Professionally, he has been a leader in organizations that promote the use of biometrics and environmental statistics. He is an elected Fellow of the American Statistical Association; a former regional president of the International Biometric Society; and the recipient of the Forest Science Award granted by the Society of American Foresters. He is a section editor of the multivolume Encyclopedia of Environmetrics, an associate editor of Silva Fennica, an editorial advisory board member of Environmental and Ecological Statistics, and he chairs the management committee of the Journal of Agricultural, Biological, and Environmental Statistics. He also serves on the board of directors of the Energy and Reources Institute–North America.