Following the completion of her internship, Dr. Valley-Gray completed the state of Florida certification requirements in school psychology including an internship in the public schools. She served as a district school psychologist for the Miami-Dade County Public School System for over five years, developing an expertise in the assessment and intervention of children diagnosed within the autistic spectrum and children who sustained a traumatic brain injury. Shortly thereafter, Dr. Valley-Gray completed a post-doctoral residency in clinical neuropsychology also at Nova.

Dr. Valley-Gray joined the faculty at the Center for Psychological Studies (CPS) in 1999. She led the development of the school psychology programs and has taken leadership at both the state and national level for the Florida Association of School Psychologists and the National Association of School Psychologists in the areas of training and credentialing. In 2006, she was appointed Director of Continuing Education and Special Projects for CPS.