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. David Retana Department: History and Social Studies Email: dretana@erusd.org 0 Phone Ext: 57004 Location: A-104 Link: Twitter: MrRetanaERHS Edmodo: MrRetanaERHS More... Instructional Manager for History Department Classes:• Economics