Larry practices in the area of water and environmental law as it relates to the exercise of water rights. He represents clients in both the Gila River Adjudication and the Little Colorado River Adjudication pending in the state courts. He also represents a major decreed right holder under the 1935 Globe Equity Decree, a consent decree entered in the United States District Court for the District of Arizona. Larry has advised states in connection with disputes over waters of the Missouri River and the Apalachicola-Chattahoochee-Flint River System.

Larry is a former Chair of the American Bar Association's Section of Environment, Energy, and Resources, and held numerous other leadership positions in that Section as well.