Martijn L.T.M. Müller, PhD, is a research assistant professor of radiology at the University of Michigan and co-director of the University of Michigan’s Functional Neuroimaging, Cognitive and Mobility Laboratory. He graduated from the University of Amsterdam with a PhD degree in psychology. His research interests include the use of positron emission tomography (PET) and magnetic resonance imaging (MRI) in the study of neurodegenerative disorders, in particular Parkinson’s disease. He has a strong interest in the modulatory effects of age-associated comorbidities and the cholinergic system on cognition and balance and gait impairments in Parkinson’s disease. Dr. Müller has authored manuscripts regarding the cognitive and motor consequences of cholinergic system denervation, cortical beta-amyloid, and white matter lesions in Parkinson’s disease.