Paul Maruff, PhD

Professor Paul Maruff is one of the founders of Cogstate and served as Chief Science Officer before taking on the role of Chief Innovation Officer. He is a neuropsychologist with expertise in the identification and measurement of subtle behavioural and cognitive dysfunction. Paul’s research integrates conventional and computerized neuropsychological testing with cognitive neuroscientific methods to guide decision making in drug development and in clinical medicine.

He has worked extensively on method to identify subtle neurocognitive impairment, and to assess the efficacy of pharmacological treatment, in Alzheimer’s disease, mild cognitive impairment and the HIV dementia complex. He has extended this approach to identify cognitive dysfunction, and monitor treatment efficacy in psychiatric diseases such as schizophrenia, obsessive-compulsive disorder and depression in adults, attention deficit disorder, developmental dyspraxia and substance abuse in children.

Paul remains an active researcher. He is appointed Professor at the Florey Institute for Neuroscience and Mental Health. He is currently clinical co-chair of the Australian Imaging Biomakers and Lifestyle (AIBL) study. Paul has published over 450 research articles in international peer-reviewed scientific journals, and has co-authored 15 book chapters.

Karra Harrington, PhD

Dr. Karra Harrington is a Senior Clinical Scientist at Cogstate, where she supports biotech and healthcare customers with a focus on digital cognitive assessments. She plays a key role in the development and validation of Cogstate’s digital cognitive tests, ensuring they meet the highest scientific and clinical standards. Before joining Cogstate, Karra was an Assistant Research Professor at Penn State. Her research centered on developing smartphone-based cognitive assessments designed to measure cognition remotely and in real-world settings.

Karra holds a PhD in Neuroscience from the University of Melbourne and a Master of Clinical Psychology from Deakin University. She was board-endorsed as a Clinical Psychologist in Australia and previously practiced for four years before transitioning to research in the United States. With over 50 peer-reviewed publications and numerous conference presentations, Karra is a recognized expert in Alzheimer’s disease research and digital cognitive assessment methodologies.

MaryBeth Bailar, Psy.D.

MaryBeth Bailar, Psy.D. is a Principal Scientist at Cogstate, where she brings extensive expertise in geriatric neuropsychology to support clinical trials for neurodegenerative diseases. Prior to joining Cogstate, she practiced as a licensed psychologist and clinical neuropsychologist in diverse settings, including academic medical centers, neurology clinics, U.S. Special Operations Command (USSOCOM), and private practice.

MaryBeth’s clinical focus has been on Alzheimer’s disease, other neurodegenerative disorders, and traumatic brain injury. She has conducted thousands of evaluations for individuals with these conditions, authored book chapters and peer-reviewed manuscripts, and provided expert witness testimony in related legal cases. Her career includes leadership and program development initiatives, such as founding and directing a neuropsychology program at a hospital-affiliated neurology practice and creating the first brain health program embedded in an elite operational unit of USSOCOM. Most recently, she owned and operated a successful private practice specializing in geriatric neuropsychological evaluations.

MaryBeth earned her undergraduate degree in psychology from Otterbein University in Westerville, Ohio, and her Master’s and Doctor of Psychology (Psy.D.) degrees in clinical psychology from Nova Southeastern University. She completed her clinical internship and postdoctoral fellowship in neuropsychology and neurorehabilitation at the VA Boston Healthcare System, with concurrent academic appointments at Harvard Medical School and Boston University School of Medicine.