Jon Jeffrey Starn, Ph.D.

I am interested in the topographic, geologic, and climatic factors that determine groundwater residence-time distributions (RTDs) in diverse aquifer settings and how RTDs relate to groundwater quality and water security. I use numerical models to simulate physical processes and statistical learning models trained on them to achieve generality. 


  • 2012 to present, Senior Numerical Modeler, USGS National Water-Quality Assessment (NAWQA). Groundwater assessment using modeling and mapping.
  • 2012 to present, Adjunct Professor, University of Connecticut. Department of Civil and Environmental Engineering. 
  • 2007 to 2012, Hydrologist, USGS National Water-Quality Assessment (NAWQA). Probabilistic simulation modeling of groundwater hydrologic and transport processes.
  • 1995 to 2007, Supervisory hydrologist, Hydrologic Modeling Section, USGS, East Hartford, Connecticut. 
  • 1989-1994, Hydrologist, USGS, Louisville, Kentucky. 
  • 1987 to 1989, Hydrologist, U.S. EPA Region IV, Atlanta, Georgia. 
  • 1985-1987, Graduate Assistant, Ohio University, Athens, Ohio.
  • 1982-1984, Water-supply hydrologist, United Nations Development Programme, Sierra Leone, West Africa.