In 1918, Eleazar served in the infantry during World War I. He was a recipient of the degree of Bachelor of Science in math from the University of Arizona in 1921. Eleazar had a desire to be in the building game. He used to follow his father who was a plaster contractor to work. Eleazar received his Architectural License in 1924. While going to school, he worked for DH JH Holmes and then for Henry O. Jaastad who later became mayor of the City. The City Council at the time urged him to join the City. If they had any problems, they would send them to Ed. He became a City Architect for five years. For 25 years, he was Chief Building Inspector for the City of Tucson. For many years, Eleazar was in private practice as an Architect and Engineer in Tucson. He was active for 60 years as a member of numerous local, state, civic, professional, government, social and religious commissions and organizations. Some awards that Ed was the recipient of were the University of Arizona Distinguished Citizen, Tucson Heritage Foundation Award for Historic Preservation and Investment as a fellow of the American Institute of Architects.
Eleazar was the donor to the University of Arizona of an endowment which has for the past 15 years provided an annual scholarship in Architecture for students of Hispanic origin and specialist in restoration and preservation of historic buildings in the Southern Arizona region most notable of which is Mission San Xavier del Bac. He also worked on the restoration of the John C. Fremont House, Casa Cordova, the Florence Jail and the Edward Nye Fish House.
Eleazar “Ed” Herreras, a soft spoken man full of energy and enthusiasm that can be seen throughout the Tucson Community.