As a qualified Clinical Neuropsychologist, Donald has a special interest in cognitive aging and dementia assessment, with more than 25 years of professional practice, advanced training, clinical research and academic teaching. He has established deep expertise in the cognitive evaluation of patients with brain disorders and providing psychological support to family caregivers, and has assisted the courts as an independent expert witness in medicolegal cases, such as personal injury compensation, mental capacity assessments in deputyship, Wills and Lasting Power of Attorney.

His extensive career in hospitals, private practice, and community settings has made him a trusted name for assessing a wide range of neuropsychological assessments including but not limited to dementia, aging, mental capacity, and medicolegal cases.