Tim has extensive experience in the water sector in the west, which is the field of law that already faces the greatest stress as climate change alters water regimes. His experience in hydropower operation, licensing, and environmental review includes work with utilities, nongovernmental organizations, and both state and federal regulators. He has also advised the California state Legislature on water law and policy and the impact of local land development on state flood protection liability. He is now working on legal issues regarding endangered species recovery for salmon and steelhead at the intersection of state water law, federal hydropower relicensing, and the obligations of state and federal agencies for dam modifications. The impact of sea level rise on coastal property management also raises important legal issues that will affect both private landowners and state regulatory agencies. Tim has also published about legal conflicts under the Federal Power Act when hydropower operation is affected by increasing integration of renewable energy sources. He is also an expert on the complex litigation around the Waters of the United States (WOTUS) rule making regarding the jurisdictional reach of federal Clean Water Act section 404 wetland permitting.