Dr. Feinstein's clinical focus is towards child and adolescent psychiatry, and the psychotherapeutic processes.

Dr. Feinstein's current research is in:

• Autism and Asperger's Disorder.
• Genetically-based neurodevelopmental disorder, including Velocardiofacial Syndrome, Smith-Magenis Syndrome, Williams Syndrome, and Fragile X Syndrome.
• Intellectual Disability (mental retardation) and psychiatric disorders.
• Developmental Language Disorder and Learning Disabilities.
• Sensory impairment in children, including visual and hearing impairment.
• Psychiatric aspects of medical illness and disability in children.