Applicants without a certificate in hearing or vision impairment, but with a degree/certification in mild/moderate disabilities, moderate/severe disabilities, or early childhood special education, may be considered if willing to seek endorsement in hearing or vision impairment. This is a substitute position for the preschool on our Oro Valley Campus, with duties as follows: PRESCHOOL POSITIONS: The Early Learning Program offers student-centered, site-based preschool services in Phoenix and Tucson for students who are DHH.