I am a hydrologist who applies tree-ring data to study the variability of streamflow, precipitation and snowpack on timescales longer than the instrumental period. Most of my work has been on basins in the western United States. I have also studied lake level variations in northern Canada, and river flow variations in Siberia. Current projects include flood occurrence along the Ob River, Russia, and snowpack variability in the Sierra Nevada of California. I am also interested in statistical methods, and teach a course in applied time series analysis ever other spring semester. For more, see my web page.