Mr. DeMaggio is a licensed professional engineer (civil and agricultural) in California and is a principal and lead engineer for Stetson Engineers' Oregon office. Mr. DeMaggio has been with Stetson Engineers since 1979, and he holds a bachelor’s degree in agricultural engineering from California Polytechnic State University, San Luis Obispo.

Mr. DeMaggio’s expertise is in water system and irrigation system design and cost estimation, municipal and agricultural water demand, dam design, and water supply and water rights investigations. He has testified in local, state, and federal water rights proceedings in California, Nevada, and Washington, and provided testimony in front of the State of California Water Resources Control Board during water rights hearings. He has extensive experience with pipe network modeling and preparing water system master plans.

Mr. DeMaggio is responsible for directing civil and agricultural engineering projects, as well as those involving the design of fish passage and hydraulic structures, and pipe network modeling. Mr. DeMaggio is the project manager for many of Stetson Engineers' tribal clients throughout the western United States. His expertise includes water rights and related infrastructure negotiations support for the Pyramid Lake Paiutes, Fort Belknap, Flathead, San Carlos, Duck Valley, Ute, Yakima, and Round Valley Indian Reservations, Agua Caliente, Zuni, and Cahuilla Band of Mission Indians, just to name a few.

Additionally, Mr. DeMaggio also designed dams and hydraulic structures located in Montana, Utah, California, and Arizona. Mr. DeMaggio has performed hydraulic calculations, pipeline design, and pipe network modeling for Santa Ynez, Wadsworth, Glendora, Pittsburg, and Solvang. Mr. DeMaggio prepared design plans and specifications and prepared engineers' cost estimations for fish passage and hydraulic structures for the County of Marin, Town of San Anselmo, and Marin Municipal Water District.

Between projects, Joe enjoys sailing in San Francisco Bay, outrigger canoe paddling and racing with Ohana Wa’a Outrigger Canoe Club, playing soccer, and fishing in Alaska.