Robert N Stewart

Senior Scientist

Robert is a senior scientist in the GeoAI group at the Oak Ridge National Laboratory (ORNL) and adjunct associate professor of Geography at the University of Tennessee. Roberts leads projects engaged in a wide array of R&D including machine learning, spatio-temporal analytics, data mining, big data workflows, simulation, visualization, and tool development. His work is informed by and applied to a wide range of use cases emerging from population dynamics, maritime safety, urban dynamics, security, energy-water nexus, health, environmental risk and many others. His own research is focused on applied mathematical, statistical, and computational methods in the areas of spatio-temporal analytics, probability modeling, and uncertainty quantification with an emphasis on risk and decision support. As a faculty member at UT, Robert engages graduate students in geography, mathematics, and the Bredesen Center Data Science Ph.D. program. He regularly serves on thesis committees, advising, and facilitating internships at ORNL.

Robert is a member of IEEE (senior member), ACM, AAAS, and AAG. He has served on numerous panels/committees, organized conference workshops, served as ORNL liaison to the World Health Organization Chemical Risk Network and chaired the AAG's Geographic Information Science and Systems Specialty Group at AAG. Robert is presently an editorial board member of the Journal Transactions in GIS and the International Journal of Geographical Information Science. 

Before arriving at ORNL, Robert was a senior research scientist at the University of Tennessee where he engaged in a variety of projects around spatial analysis including initialization and maturation of the SADA program which is continue today. SADA is internationally recognized for its success in “spatializing” regulatory human and ecological risk models and integrating it across all aspects of the characterization and restoration process from sample design to final decision outcomes.

In 2011 Robert received his Ph.D. from the Geography Department at the University of Tennessee for his work in connecting the spatial sciences with exposure modeling and regulatory guidance for radiological contaminated sites.  Robert holds a Masters and Bachelor of Science in Mathematics from UT as well.


ORNL National Security Sciences Directorate Distinguished Researcher Award (2022)
Ecological Society of America Sustainability Science Award for US cities can manage national hydrology and biodiversity using local infrastructure policy, (2021)
Oak Ridge National Laboratory Significant Event Award for WSTAMP deployment. (2019)
Oak Ridge National Laboratory Significant Event Award for WSTAMP deployment. (2014)
Environmental Protection Agency 2010 Scientific and Technological Achievement Award (2010)