Claire Tiedeman is a Research Hydrologist at the U.S. Geological Survey, where her work involves characterizing and modeling flow and transport in fractured rock aquifers, calibrating and evaluating models of complex groundwater flow systems, and developing methods to evaluate prediction uncertainty. She is co-coordinator of USGS research on contaminant transport and remediation at the former Naval Air Warfare Center, and is co-author of the textbook Effective Groundwater Model Calibration: With Analysis of Data, Sensitivities, Predictions, and Uncertainty.