She is the author of the chapter entitled "Service Delivery Issues in Early Intervention" in R. Lubinski & M. Hudson's (Eds.) Professional Issues in Speech-Language Pathology and Audiology: Fourth Edition (2013). She teaches courses and conducts research in the areas of early speech and language development and disorders, efficacy of caregiver and childcare provider training, the relationship between music therapy and communication intervention with young children, and clinical supervision. Dr. Cassidy is certified as a speech-language pathologist by the American Speech-Language-Hearing Association and is licensed to practice speech-language pathology in the Commonwealth of Virginia.