Our Psychologists

Our Psychologists

Rebecca Cicha


Dr. Rebecca Cicha, PhD

Rehabilitation Psychologist

Dr. Cicha is a certified provider of cognitive processing therapy for Post-Traumatic Stress Disorder (PTSD). Her clinical interests include adjustment to disability and medical illness; PTSD; cognition and cognitive impairment; personality assessment; visual impairment; and chronic disease self-management.

Dr. Cicha is a graduate of the University of North Dakota, with initial clinical training in neuropsychological assessment, developmental disorders/disabilities and visual impairment.

Dr. Cicha holds an APA-accredited postdoctoral fellowship in rehabilitation psychology from the James A. Haley Veteran’s Hospital in Tampa, Florida with training emphasis in assessment and treatment of patients with spinal cord injury, amyotrophic lateral sclerosis (ALS), chronic pain, traumatic brain injury, stroke, orthopedic injuries, amputation, and chronic medical illness.


Gina Delgardo, PhD


Dr. Gina Del Gardo

Clinical Psychologist

Dr. Gina Del Gardo holds a degree in behavioral medicine and rehabilitation psychology. She specializes in the evaluation and treatment of emotional responses to injury and illness and the factors that promote adjustment and rehabilitation. She has expertise in the treatment of chronic pain, post-traumatic stress disorder and biofeedback/muscular re-education. Her clinical interests include adjustment to medical illness; amputation; forensic psychology; and coping with traumatic injury.

Dr. Del Gardo obtained her doctorate at Nova Southeastern University. She interned at the VA Medical Center in North Chicago, which included tracks in neuropsychology, the Post Traumatic Stress Disorder Treatment Unit and Consultation to General Medicine and Surgery. She is a licensed clinical psychologist and included on The National Register of Health Service Providers in Psychology.


Anita Trowbridge PsyD


Dr. Anita F. Trowbridge, PhD

Clinical Psychologist

A clinical psychologist with expertise in neuropsychology and rehabilitation, Dr. Trowbridge specializes in evaluation and treatment of individuals living with a disability or chronic medical condition. She has more than 20 years of experience working with survivors of brain injury and their families. Her clinical interests include age-related issues; caregiver stress; grief/loss issues; and adjustment to chronic medical illness.

Dr. Trowbridge obtained her doctorate at Florida Institute of Psychology. She completed an internship at Eastern Virginia Medical School in Norfolk, with rotations at Riverside Rehabilitation Institute; the Hancock Geriatric Treatment Center and Neuropsychology Services at Eastern State Hospital; the Residency Clinic at Eastern Virginia Medical School; and the Riverside Therapy Services Brain Injury Recovery Center. She completed a post-doctoral fellowship in rehabilitation psychology at Siskin Hospital for Physical Rehabilitation.



J Christopher Young


Dr. J. Christopher Young, PhD, ABPP

Clinical Neuropsychologist

Dr. Young’s expertise lies in the diagnosis and treatment of cognitive and neuropsychiatric disorders across the lifespan. He specializes in the treatment of dementia, traumatic brain injury, stroke, movement disorders, and cognitive effects of chronic medical illness. He has extensive experience in the evaluation of a wide range of pediatric cognitive disorders including those resulting from traumatic brain injury, cancer and epilepsy. His clinical interests also include aviation neuropsychology and forensic neuropsychology.

Dr. Young is the co-director of Siskin Hospital’s Stroke Recovery Aftercare Program. He provides advanced expertise in the diagnosis and treatment of cognitive and neuropsychiatric disorders across the lifespan, including dementia, stroke, movement disorders, traumatic brain injury and cognitive effects of chronic medical illness. Additionally, he provides evaluation and consultation services for a wide range of medicolegal issues pertaining to neurocognitive dysfunction. Dr. Young sees patients who are in Siskin Hospital’s Inpatient and Outpatient Therapy Programs.


Heather England, PsyD

Dr. Heather B. England, PsyD

Clinical Neuropsychologist

Dr. England has expertise in the diagnosis and treatment of cognitive and neuropsychological conditions. She specializes in the assessment and treatment of traumatic brain injury, dementia, stroke, movement disorders and other medical and neurological conditions that affect cognitive functioning. Additionally, Dr. England specializes in cognitive rehabilitation therapy, an evidence-based therapy that uses an individualized and targeted approach to implement compensatory strategies in order to enhance and improve cognitive functioning and increase independence.

At Siskin Hospital, she conducts neuropsychological and psychological evaluations, conducts cognitive rehabilitation therapy and provides consultation services for inpatient and outpatient therapy programs. She obtained her doctorate from Georgia School of Professional Psychology, and completed her neuropsychology-tracked clinical internship at the Bay Pines VA Medical Center, where she also completed her two-year postdoctoral fellowship in clinical neuropsychology, an accredited program of the Association of Postdoctoral Programs in Clinical Neuropsychology (APPCN).


Dr Charles Schmittdiel


Dr. Charles Schmittdiel, PhD

Clinical Psychologist

Dr. Schmittdiel is a licensed psychologist/health service provider with expertise and certification in behavioral sleep medicine, including cognitive behavioral therapy for insomnia, an evidence-based treatment now recognized by the American Academy of Sleep Medicine and the American College of Physicians as a first-line treatment intervention for adults with chronic insomnia. Behavioral sleep medicine also includes working with individuals with other sleep disorders, such as patients struggling with CPAP use for sleep apnea, coping with narcolepsy and RLS, and managing parasomnias such as sleep walking. He also has extensive experience with cognitive behavioral therapy interventions for other behavioral conditions, including anxiety and coping with chronic pain.

Dr. Schmittdiel has also worked in the bariatric field for several years, including with two accredited bariatric surgical centers, as part of the interdisciplinary bariatric surgical process. He has more than 30 years of experience in the field of clinical psychology and is the only certified behavioral sleep medicine practitioner in the Chattanooga area. Dr. Schmittdiel obtained his doctorate from the University of Nebraska-Lincoln and completed his internship at the Baylor College of Medicine. He is certified in behavioral sleep medicine by the American Board of Sleep Medicine and is recognized by the National Register for Health Service Psychologists.


Dr. Thomas McLaren


Dr. Thomas McLaren, PhD

Clinical Neuropsychologist

Dr. McLaren specializes in the assessment of a wide range of neurologic disorders, and his clinical interests include geriatric/aging issues in cognition; learning and attentional disorders in Adults; and evaluation of cognitive functional ability in medical and neurological disorders. Dr. McLaren has made a number of academic and professional presentations in his area of expertise, including Neuropsychology for the Medical Practitioner; Neuropsychology for the Psychiatric Practitioner; Use of Performance Validity Measures in Social Security Examinations; The Neuropsychological IME; and many more.

Dr. McLaren is a graduate of Ball State University. He is a Diplomate of the American Board of Professional Neuropsychology and a member of the American Board of Professional Neuropsychology. He has served as a member of the Credentialing Committee/Board of Directors for the American Board of Professional Neuropsychology; as a Program Committee member of the National Academy of Neuropsychology; and is a Fellow of the American College of Professional Neuropsychology.


Please call 423.634.1400 for more information or to schedule an appointment with one of our psychologists.

Call to insist on Siskin 423.634.1200
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