Mary Free Bed’s team of rehabilitation experts is here to help you recover not only physically but emotionally. Our Psychology service provides care that supports any challenge you’re facing.

Services include:
• Counseling and psychotherapy for patients and families struggling with traumatic brain injury, spinal cord injury, stroke and other conditions.
• Evaluation of cognitive difficulties, such as memory loss in suspected early Alzheimer’s disease, and recommendation for treatment, independence and safety.
• Coordination of behavioral interventions and health care management.

The Psychology service also is actively involved in training interns and residents, and with an applied research program.

Dr. Parks in Pain Clinic


Lauren Berrill, Psy.D..

Dr. Lauren BerrillDr. Berrill obtained her Psy.D. from Yeshiva University and completed her pre-doctoral internship at the Icahn School of Medicine at Mount Sinai. She joined Mary Free Bed in 2021 for her post-doctoral residency in lifespan clinical neuropsychology and rehabilitation.

Her interests include the neuropsychological assessment of individuals across the lifespan with complex neuromedical, psychiatric and cognitive difficulties, including head trauma, congenital and acquired neurologic conditions. She also enjoys working therapeutically using cognitive remediation to optimize recovery and adaptive functioning.

Nia Billings, Ph.D.

Dr. Nia BillingsDr. Billings is a clinical psychologist who joined the inpatient rehabilitation team at Mary Free Bed at Covenant HealthCare in 2020. She helps patients adjust to and overcome challenges following an illness or serious injury.

She holds a master’s degree in Counseling Psychology from Loyola University Maryland and earned a doctorate in Clinical Psychology from Wayne State University. Dr. Billings completed her pre-doctoral internship at the Cincinnati VA Medical Center and a post-doctoral fellowship in neurorehabilitation psychology at the University of Kansas Medical Center.

Prior to completing her doctoral program, Dr. Billings worked as a researcher at Johns Hopkins University and the National Institutes of Health, and as a community advocate and service coordinator for adults with developmental disabilities.

Beth Blackbird, Psy.D., ABPP (RP)


Beth BlackbirdDr. Blackbird, who joined Mary Free Bed in 2001, is board certified in rehabilitation psychology by the American Board of Professional Psychology. She’s 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, neuromuscular/neurodegenerative disorders, 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 did therapy and diagnostic practicums at the Shirley Ryan Ability Lab (formerly the Rehabilitation Institute of Chicago) and at the University of Chicago, Billings Hospital. She completed her internship at Illinois Masonic Medical Center and a fellowship at Magee Rehabilitation Hospital and Hahnemann University Hospital.

Jacobus Donders, Ph.D., ABPP

Chief Psychologist

Dr Jacobus DondersDr. Donders, who’s been with Mary Free Bed since in 1988, serves as chief psychologist. He’s board certified by the American Board of Professional Psychology in clinical neuropsychology, rehabilitation psychology and pediatric clinical neuropsychology. 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.

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. He has received national recognition for his work from the American Board of Rehabilitation Psychology (Diller Award, 2012) and the National Academy of Neuropsychology (Reitan Award, 2019.)

Roger Erickson, Ph.D.


Roger EricksonDr. Erickson is on the inpatient pediatric rehabilitation and outpatient day rehabilitation teams, helping children and their families cope and adjust to hospitalization and medical illness and injury. He joined Mary Free Bed in 2016.

Dr. Erickson earned a doctorate in clinical psychology from Fuller Theological Seminary and 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.

Timothy Gruppen, Psy.D.


Timothy GruppenDr. Gruppen joined Mary Free Bed in 2013. He earned a master’s degree and doctorate in clinical psychology from Wheaton College. He completed his pre-doctoral internship at Meier Clinics and began working in the rehabilitation field at Methodist Rehabilitation Center during his post-doctoral training.

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

Michael Scholz, Psy. D.

Dr. Michael ScholzDr. Scholz joined Mary Free Bed in 2021 as a neuropsychology postdoctoral resident. He received his doctoral degree in Clinical Psychology from Wheaton College after completing his predoctoral internship at the University of Texas Health Science Center at Tyler. He received his master’s degree from Sam Houston State University.

A member of Division 40 of the American Psychological Association, his interests include neuropsychological assessment of individuals experiencing a variety of neuropsychiatric concerns, brief psychotherapy with those experiencing mood disorders, autoimmune conditions that affect cognitive functioning and cognitive rehabilitation.

Maggie Travin, MA, LLP, LPC


Maggie TravinMaggie, who joined Mary Free Bed in 2016, has served patients with developmental and acquired disabilities in a variety of positions since 2010. She began working in the rehabilitation field with University of Michigan’s Spinal Cord Injury Modeling Systems in 2013 and has continued her work in both research and clinical capacities.

She earned a master’s degree in clinical psychology from the Chicago School of Professional Psychology. Her interests include cancer rehabilitation, post-concussion, spinal cord injury and trauma assessment and treatment.

Jessica Tsou, Psy.D.


Jessica TsouDr. Tsou has been with Mary Free Bed since 2016. She completed her doctoral degree in clinical psychology from Nova Southeastern University, a pre-doctoral internship at Broward Health Medical Center and a 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.

Kate Wilson, Ph.D., ABPP


Kate WilsonDr. Wilson obtained her Ph.D. from the University of Nebraska-Lincoln in 2009 and completed an internship at Oregon Health Science University’s Child Development and Rehabilitation Center, a LEND program. She did her post-doctoral residency at Mary Free Bed in 2011. Dr. Wilson worked with the pediatric acute and rehabilitation teams at Wake Med 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.

Carrie Pappas, MA, LLP


Carrie PappasCarrie earned a master’s degree in counseling psychology with a graduate certificate in holistic health from Western Michigan University. She’s been with Mary Free Bed since 2003 and enjoys working in the outpatient setting, providing therapy services to patients experiencing mood and anxiety and/or other adjustment difficulties after concussion. She also provides weight loss and weight maintenance services through the Mary Free Bed Weight Management program.

Pain Psychologists

Physical and emotional health are closely linked, and the role of psychology in chronic pain management is significant. Our pain psychologists employ a personalized approach to treatment.

Julia Craner Cooper, Ph.D., ABPP

Dr. Julia Craner CooperDr. Craner Cooper is a clinical psychologist and the team leader for pain psychology at Mary Free Bed. She completed her doctoral degree at the University of Maine, an internship at the VA Ann Arbor Healthcare System and a postdoctoral fellowship in Health Psychology at the Mayo Clinic. She is board certified in Behavioral and Cognitive Psychology and has an adjunct assistant professor affiliation with Michigan State University College of Human Medicine. Dr. Craner Cooper also has an appointment as a research associate in the Center for Research and Innovation at Mary Free Bed.

Her clinical and research interests focus on the way individuals interpret and respond to somatic symptoms, such as chronic pain, and how these can be modified in treatment to improve outcomes. She has over 40 publications in this area. Dr. Craner Cooper, who joined Mary Free Bed in 2017, also is interested in evaluating treatment outcomes and dissemination of evidence-based practices for chronic pain.

Eric Lake, M.A., LLP

A master’s-level psychologist who specializes in the treatment of chronic pain, Eric joined the Mary Free Bed Pain Rehabilitation Program in 2016. Eric focuses on the use of evidence-based psychological treatment for chronic pain, helping patients get back to the things in life which are most important to them. In addition to individual therapy, Eric enjoys providing group treatment for chronic pain and research into pain and its treatment. He values the development of a collaborative relationship, working with patients to achieve goals that increase quality of life.

Eric received his master’s degree in Counseling Psychology from Western Michigan University and practices as a Limited Licensed Psychologist. He’s a certified alcohol and drug counselor and has experience in the treatment of pain, mental health issues and substance use disorders in several different settings.

Arianna Perra, Psy.D.

Dr. Perra specializes in working with patients with chronic illnesses and the many ways health issues can impact our lives. She joined Mary Free Bed in 2020 with 12 years of experience across chronic pain, rehabilitation and hospital settings.

Dr. Perra earned her doctorate in Clinical Psychology from Loyola University Maryland. Her areas of focus include interdisciplinary care, evidence-based psychotherapies, collaborative treatment planning, the sociocultural context of mental health and training and supervision.

Heather Dermyer, Ph.D.

Dr. Dermyer, a clinical health psychologist who specializes in pain management, trauma and sport psychology, joined Mary Free Bed in 2018. She earned a master’s degree in Health Psychophysiology and a doctorate in Integrative Health Psychology from Saybrook University. In addition to experience in many health care settings, Dr. Dermyer has instructed doctoral students in mind-body medicine and was a mind-body specialist at the United States Olympic training site in Marquette, where she worked with Olympic-hopeful athletes, among others. She’s also worked with the Green Bay Packers, the Northern Michigan University football team and the United States cross country team.

While working at inpatient and outpatient substance abuse facilities, she gained contractual experience with the Federal Bureau of Prisons and the Michigan Department of Corrections with incarcerated individuals.

Dr. Dermyer (and her registered therapy dog) work for Mary Free Bed in Traverse City, where she conducts opioid assessments, presurgical evaluations and provides treatment for teens and adults with a range of psychological needs.

Evan Parks, Psy.D.

Dr. Parks earned a master’s degree in Psychology from Western Michigan University and a doctorate in Clinical Psychology from the Forest Institute’s Chicago campus. He completed his post-doctoral fellowship in clinical psychology at Wayne State University School of Medicine. He serves as an adjunct assistant professor in the Division of Rehabilitation Medicine at Michigan State University College of Human Medicine. He has been on staff at Mary Free Bed Rehabilitation Hospital since 2017.

Dr. Parks is the author of the book, “Chronic Pain Rehabilitation: Active pain management to help you get back to the life you love.” He is a contributor to Psychology Today and a mental health expert for WikiHow.