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Below is information about the psychologists at Mary Free Bed Rehabilitation Hospital.


Beth Blackbird, PsyD, ABPP(RP)

Dr. Blackbird, who joined Mary Free Bed in 2001, is board-certified in rehabilitation psychology by the American Board of Professional Psychology. She is a member of Division 22 of the American Psychological Association. Her special interests include working with patients and families dealing with spinal cord injury, cancer, stroke, dementia and acquired brain injury. Her focus is on helping people develop resilience and coping strengths in the face of trauma, disability and other major life transitions.

Dr. Blackbird is a graduate of Illinois School of Professional Psychology. She interned at Illinois Masonic Medical Center in Chicago and completed a fellowship at Magee Rehabilitation Hospital and Hahnemann University Hospital in Philadelphia.


Jacobus Donders, PhD, ABPP

Dr. Donders is chief psychologist at Mary Free Bed. He obtained his doctorate from the University of Windsor. He joined Mary Free Bed in 1988. He is board-certified by the American Board of Professional Psychology in clinical neuropsychology, rehabilitation psychology and pediatric clinical neuropsychology. He is the associate editor of the journals Child Neuropsychology and Archives of Clinical Neuropsychology. He also serves on the editorial boards of several other journals, and on the board of directors of the American Board of Clinical Neuropsychology. He has more than 100 publications in peer-reviewed journals.

His main research interests include construct and criterion validity of neuropsychological test instruments and prediction of outcome after traumatic brain injury. Dr. Donders is a fellow of the National Academy of Neuropsychology and of Divisions 40 (society for clinical neuropsychology) and 22 (rehabilitation psychology) of the American Psychological Association.


Roger Erickson, PhD

Dr. Erickson joined Mary Free Bed in 2016. He earned a doctorate in clinical psychology from Fuller Theological Seminary and completed three years of specialized post-doctoral training. He first completed a one-year pediatric psychology post-doctoral fellowship through the University of Arkansas for Medical Sciences, a training program that included working with patients with chronic medical conditions and developmental disabilities, and specialized interdisciplinary training through the Leadership and Education in Neurodevelopmental Disabilities program. He also completed a two-year fellowship in pediatric rehabilitation psychology and neuropsychology through the University of Michigan Health System, Department of Physical Medicine and Rehabilitation.

Dr. Erickson is on the inpatient pediatric rehabilitation team and outpatient day rehabilitation program, helping children and their families cope and adjust to hospitalization and medical illness and injury.


Timothy Gruppen, PsyD

Dr. Gruppen joined Mary Free Bed in 2013. He completed his undergraduate degree at Calvin College and earned his MA and PsyD in clinical psychology from Wheaton College. He completed his pre-doctoral internship at Meier Clinics in Wheaton, Ill. He began working in the rehabilitation field at Methodist Rehabilitation Center in Jackson, Miss., during his post-doctoral training.

Dr. Gruppen enjoys working with people with a wide variety of rehabilitation concerns, including stroke, spinal cord injury, brain injury, concussion and oncology. He is a member of Division 22 of the American Psychological Association.


Catherine Kaneti, PsyD

Dr. Kaneti has worked in the rehabilitation field since 1997. She holds degrees from the University of Illinois and Chicago School of Professional Psychology. She completed her internship at Oak Forest Hospital in Oak Forest, Ill., and her post-doctoral residency at Marianjoy Rehabilitation Hospital in Wheaton, Ill. She has worked with people who have experienced head injuries, spinal cord injuries, strokes and a variety of other neurological conditions.

She has worked at Mary Free Bed since 2005.


Jessica Tsou, PsyD

Dr. Tsou joined Mary Free Bed Rehabilitation Hospital as a staff psychologist in 2016. She received her undergraduate degree from the University of Illinois Urbana-Champaign, and her doctoral degree in clinical psychology from Nova Southeastern University. She completed her pre-doctoral internship at Broward Health Medical Center, and her post-doctoral fellowship in neurorehabilitation psychology at the University of Kansas Medical Center.

Her interests include assessment and treatment of adults with traumatic brain injury, stroke, spinal cord injury and medical complexities.


Kathryn Wilson, PhD, ABPP

Dr. Wilson obtained her PhD from the University of Nebraska-Lincoln in 2009 and her internship at Oregon Health Science University’s Child Development and Rehabilitation Center, a LEND program. She completed her post-doctoral residency at Mary Free Bed in 2011. Dr. Wilson worked with the pediatric acute and rehabilitation teams at Wake Med in Raleigh, N.C., before returning to Mary Free Bed in 2017.

Her primary interests include the neuropsychological assessment of children and adolescents with neurological and developmental concerns, such as traumatic brain injury, concussion, spina bifida and sickle cell disease, as well as working with underserved populations.