About Us

Core Staff Profiles

Nick A. DeFilippis, Ph.D.
Director and Founder
Dr. DeFilippis has been in private practice since 1978. He received his professional training at the University of Iowa and the University of South Florida. He is board certified in clinical and neuropsychology and has published widely and presented internationally in both areas. Dr. DeFilippis has held several teaching appointments and is currently a Professor in a clinical psychology doctoral training program that is approved by the American Psychological Association. In that program he is the coordinator of the neuropsychology training concentration. His clinical interests include assessment, brain injury and forensic consultation with children and adults.

Gail Natter, MA, CAC II, LPC, CCS
Ms. Natter is a Licensed Professional Counselor and Certified Addiction Counselor. She is co-director of APA’s outpatient chemical dependency treatment program and serves as a provider of chemical dependency treatment services for the State of Georgia. Ms. Natter’s interests include treatment of drug and alcohol problems and program development.

Associated Professionals:

To contact these individuals , please call the phone number listed after their name.

Thomas G. Burns, Psy.D. 770-220-0887
Dr. Burns is the Director of Neuropsychological Services at Children’s Healthcare of Atlanta. He is board certified in neuropsychology and has published numerous papers in the areas of pediatric and adult neuropsychology. He has testified in a number of courts as an expert in neuropsychology. His interests include neuropsychological assessment of children and adults, forensic consultation and research in test development.

James Millhouse, Ph.D. 678-468-4653
Dr. Millhouse has provided psychological services to adolescents and adults for 20 years. Throughout that time he has had a specialty in Sports Psychology and Sports Performance Enhancement. He now specializes in working with numerous professional and amateur athletes. His clients have included champion boxers, skaters, Olympians, and professional and collegiate hockey, basketball, and football teams. In addition to the above interests, Dr. Millhouse is skilled in the use of hypnotherapeutic treatment of habit disorders such as smoking.

Ray Horwitz, D.O. 770-394-5050
Dr. Horwitz specializes in psychotherapy and medication management of the full range of psychiatric disorders in patients of all ages. He has a particular interest in the treatment of Attention Deficit Disorder in adults and children. His collegiate sports background has contributed to his current work with a number of athletes for the purpose of performance enhancement.

Steven Hobbs, Ph.D 770-671-1200, ext. 1021
Dr. Hobbs is a pediatric psychologist who specializes in the assessment and treatment of children with developmental delays and chronic medical conditions. Over the past 25 years, he has had appointments in departments of pediatrics and psychiatry at the University of Oklahoma, West Virginia University, and Emory University. He is currently Professor of Psychology in the clinical training program at the Georgia School of Professional Psychology at Argosy University.

In addition to the core staff, APA has arrangements with a large number of mental health associates in all fields to provide various specialized services to our clients. These associated professionals provide services through our offices or in other locations. Our EAP network of providers is available in locations throughout the country.

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