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Timothy Sigward, Ph.D. | Licensed Psychologist

​Clinical Geropsychologist, Neuropsychological Evaluation

Dr. Sigward is a clinical psychologist who specializes in the neuropsychological / psychological assessment of and the application of psychological/behavioral interventions for the elderly.  He has training in neuropsychology and health psychology. After obtaining his Ph.D. in Clinical Psychology from Saint Louis University, Dr. Sigward formed his private practice in 2003 where he provides assessment, treatment, and consultation to older adults and their families.  He specializes in diagnosis of dementia and cognitive impairment, behavioral management of dementia, competency, and the functional assessment of older adults.  He has been with NCGC as its clinical director since its beginning in 2016.

neuropsychological testing

Professionals //

Mark Dallas, Psy.D. | Licensed Psychologist

Neuropsychological & Psychological Assessment

Mark Dallas, Psy.D. is a Clinical Neuropsychologist who specializes in neuropsychological/psychological assessment of adults with a primary focus with the elderly.  Dr. Dallas completed his undergraduate education at Wittenberg University. He later completed a Master’s Degree from Murray State University and a Doctorate from Xavier University, both in Clinical Psychology. Dr. Dallas competed his clinical training with a postdoctoral clinical neuropsychology fellowship and an APA accredited internship at the Louis Stokes Cleveland VA Medical Center in Cleveland, Ohio.  He practiced at the Lindner Center of Hope for four years following his residency serving as their Adult Neuropsychologist and more recently as a consultant Neuropsychologist in the Acute Rehab Units within the Mercy Health System.  Dr. Dallas is member of the Ohio Psychological Association, the International Neuropsychological Society, and the National Academy of Neuropsychology.

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