1986-1996: Project chief, multi-State, multi-disciplinary teams, USBM

1997-2001: Project chief, Upper Illinois River Basin (UIRB), National Water Quality Assessment Program, USGS (http://water.usgs.gov/nawqa/)

1997-2001: Chair, Annual liaison meetings, budget conference calls, project reviews, Upper Illinois River Basin, National Water Quality Assessment Program, USGS

2003: Co-chairman, American Geophysical Union poster session (H12A) - Model calibration, parameter nonuniqueness, and predictive uncertainty associated with flow transport in variably saturated media. Amer. Geophysical Union, Fall Meeting, Dec. 8-12, San Francisco, CA.

2004: Co-chairman, American Geophysical Union poster session (H33B) - Preferential flow and transport in variably saturated porous media. Amer. Geophysical Union, Fall Meeting, Dec. 11-14, San Francisco, CA.

2001- 2004: Member, Senior technical staff, Colorado-Water Science Center, USGS.

2003: Co-Chairman, Model Calibration, Parameter Nonuniqueness, and Predictive Uncertainty Associated With Flow and Transport in Variably Saturated Media, Hydrology session H12A, American Geophysical Union, 2003

2004: Co-chairman, Preferential Flow and Transport in Variably Saturated Porous Media, Hydrology oral session, H33B, American Geophysical Union, 2004

2005: Co-chairman, American Geophysical Union oral session (H13I) - Preferential flow and transport in variably saturated porous media. Amer. Geophysical Union, Fall Meeting, Dec. 11-14, San Francisco, CA.

2005: Co-chairman, American Geophysical Union poster session (H12) - Spatial Relations Between Plants, Soil, and Water in the Vadose Zone, Amer. Geophysical Union, Fall Meeting, Dec. 11-14, San Francisco, CA.

2005: Chairman, Flood predictions in ungauged basins, Oral session, International Symposium – Methods in Hydrology, Hohai University, 2005

2005: Co-chairman, Special session - Flood predictions in ungauged basins, International Symposium - Methods in Hydrology, Nov. 2, Nanjing, China.

2006: Co-chairman, Conference on Hydrological hazards in Central America and the Caribbean - Progress and Future Challenges in Monitoring and Prediction, 50 scientists from 14 countries; San Salvador, El Salvador. Sponsored by Centroamericana, Fortalecimiento a la Gestión Ambiental en El Salvador (FORGAES), and Hydroelectrical Comision for the Rio Lempa (CEL)

2006: Co-chairman, American Geophysical Union poster session (H33) - Preferential flow and transport in variably saturated porous media. Amer. Geophysical Union, Fall Meeting, Dec. 11-14, San Francisco, CA.

2007: Co-chairman, American Geophysical Union oral session: Improved Estimation and Prediction in Earth Science Through Integration of Multiple Data Sets and Model Types, Near Surface geophysics oral session NS43A, American Geophysical Union, December 13, 2007.

2008, Member, National Hazards Panel, Expert on Flood Prediction, 2nd U.S. Geological Survey Modeling Conference, Perdido Beach, AL; February, 2008

2008, Co-chairman, Multi-Scale Unsaturated Zone Flow and Contaminant Transport Processes, Hydrology poster session H13F, American Geophysical Union, December, 2008

2008, Co-chairman, Application of Joint Inverse Methods for Improved Characterization and Assessment of Ground-Water, Mineral, and Petroleum Resources, Near Surface geophysics poster session, NS31A, American Geophysical Union, December, 2008

2009, Co-chairman, Relationship of Natural and Anthropogenic Hazards to National and Global Security, Public Affairs poster session, PA21B, American Geophysical Union, December, 2009

2009, Co-chairman, Advanced Inverse Strategies for Improved Characterization and Assessment of Groundwater, Mineral, and Petroleum Resources I, Near Surface geophysics poster session, NS31A, American Geophysical Union, December, 2009

2009, Co-chairman, Advanced Inverse Strategies for Improved Characterization and Assessment of Groundwater, Mineral, and Petroleum Resources I, Near Surface geophysics oral session, NS41A, American Geophysical Union, December, 2009

2010: Co-chairman, Environment and Environmental Security NATO Advanced Research Workshop series: Climate change Effect on Water Supplies – Issues of National and Global Security, Izmir, Turkey, Sept.1-5, 2010.