Dr. Stephen Gingerich has been a research hydrologist for the U.S. Geological Survey since 1995, and is now located in Portland, Oregon. Dr. Gingerich has extensive experience in the hydrology and water resources of oceanic islands - he has worked on groundwater resources issues on islands all over the world, with a focus on Hawaii. He performed field studies to characterize island coastal aquifers, recharge, and hydrogeology, and he is an expert on numerical modeling of seawater intrusion in coastal aquifers.