At Diversified Psychological Services, we're comitted to working with patients, families, and referral sources to provide the highest level of expertise in the field of neuropsychology.


Dr. Thomas Swirsky-Sacchetti, Ph.D

Founding and Managing Director

Thomas Swirsky-Sacchetti, Ph.D. is a board-certified neuropsychologist with over 35 years of experience in the assessment and treatment of patients with a wide variety of disorders affecting brain function, including traumatic brain injury/concussion, dementia, stroke, seizure disorders, multiple sclerosis/autoimmune disorders, learning disorders, Attention Deficit Hyperactivity Disorder, and emotional disorders. After obtaining his Ph.D. from Temple University, he developed and ran the neuropsychology center at Jefferson Medical College for a decade before entering private practice. He

continues to be an Adjunct Associate Professor at Jefferson in the Department of Psychiatry and an Adjunct Professor at Philadelphia College of Osteopathic Medicine. Dr. Sacchetti enjoys teaching and supervising doctoral students in clinical psychology at several universities throughout the Delaware Valley.

Dr. Robert Rider Ph. D.

Clinical Neuropsychologist


Dr. Rider is a clinical neuropsychologist with over a decade of clinical experience in the assessment of neurologic and psychiatric disorders. He completed his bachelor of science in Psychology with honors from the University of Arizona in Tucson in 2002 and earned his doctorate of philosophy in Clinical Psychology in 2012 from Drexel University in Philadelphia. Dr. Rider completed his post-doctoral fellowship at Thomas Jefferson University Hospital’s Center for Neurosciences in the Department of Neurology in 2014. Robert is an active member of the American Psychological Association, Pennsylvania Psychological Association, Philadelphia Neuropsychological Society, the American Academy of Clinical Neuropsychology, and the International europsychological Society. Dr. Rider has diverse experience in the assessment and rehabilitation of cognitive functioning in a variety of disorders and diseases including traumatic and anoxic brain injury, stroke, learning disorders, chronic pain, epilepsy, dementia, and sleep disorders. He is also a licensed and practicing psychotherapist, a consultant for memory care facilities, and has served as a community educator on many topics related to brain health. Dr. Rider has been published in a number of peer-reviewed journals including Aviation, Space, and Environmental Medicine, the Journal Sleep, and Epilepsia. Currently. Dr. Rider works in private practice at Diversified Psychological Resources in Philadelphia.

J. Jason Van Steenburgh, Ph.D.

Consulting  Neuropsychologist

Dr. van Steenburgh completed his undergraduate work at Duke University and earned his doctorate in Neuropsychology from Drexel University. He completed an Internship in Neuropsychology at Vancouver Coastal Health in Vancouver, BC, and his post-doctoral fellowship at The Johns Hopkins School of Medicine. He has conducted research applying direct current stimulation to improve cognitive functioning in schizophrenia and autism. Dr. van Steenburgh provides neuropsychological evaluation for adults of all ages and neurological conditions, as well as cognitive remediation, education, support, and therapeutic services in assisted living and memory care communities for older adults, their caregivers, and their families.

Dr. Kelsey Feret, Psy.D.

Post-doctoral Fellow

Dr. Kelsey Feret is currently completing her post-doctoral residency at Diversified Psychological Resources. Dr. Feret received her Psy.D. from La Salle University in 2019 and she has interests in forensics, neuropsychology, and cultural humility. She has worked at Joseph J. Peters Institute providing forensic evaluations and court-mandated treatment to adult and adolescent sex-offenders and perpetrators of relationship violence. Dr. Feret has also completed clinical training in residential treatment facilities for adolescents with sexual behavior problems in addition to the Center for Neurological and Neurodevelopmental Health, a neurology clinic focused on pediatric neuropsychology. She had previously worked at Child Guidance Resource Centers and is trained in functional behavior analysis. Dr. Feret completed her predoctoral internship at Trenton Psychiatric Hospital, which included a once a week placement at Cooper Neuropsychology. Dr. Feret has several years of research experience at La Salle University, including managing La Salle’s Ecology of Emotion

lab. There, she oversaw and trained undergraduate research assistants and participated in the design and execution of experimental designs that have been presented at the Positive Psychology conference and Association for Psychological

Science’s annual convention. She has interests in olfaction and the effects of emotional chemosignals on human behavior, as well as the effects of affect on racial bias. Her doctoral dissertation involved an experimental design exploring the effects of mood induction on implicit racism. Dr. Feret has integrated her research interests on mood and racism into cultural humility presentations that have been utilized as colloquia trainings for New Jersey’s state hospital psychology internship program.

Dr. Katie Fabius, Psy. D.

Post-doctoral Fellow

Katie Fabius, Psy.D. holds a bachelor’s degree in Psychology from George Mason University and a master’s degree in Experimental Psychology from St. Joseph’s University. She obtained a master’s degree and Psy.D. in Clinical Psychology from Philadelphia College of Osteopathic Medicine. She completed her doctoral internship at Beechwood NeuroRehab in Langhorne, Pennsylvania and is completing her post-doctoral fellowship in clinical neuropsychology at Diversified Psychological Resources in Philadelphia, Pennsylvania. Her assessment and research interests are in neurodevelopmental disorders, including attention-deficit/hyperactivity disorder. She is clinically trained in cognitive-behavioral therapy and mindfulness-based interventions and treats patients with a variety of anxiety and mood disorders. 

Office Staff

Elyse K. Gollomp