ERHS Staff Access Voice Mail by first dialing the school's main number: (562) 801-7500 Arrange by department... Administration Classified Counselor English History and Social Studies Math Physical Education Resource ROP Science Special Education World Languages Visual and Performing Arts All Departments 0 items found. Cecilio Alonso Department: Science Email: calonso@erusd.org 0 Phone Ext: 57194 Location: S-4 Link: Twitter: AlonsoCalonso Edmodo: More... Classes:• Living Earth Biology • Human Body System • Medical Interventions