A/Prof. Liew is a Senior Consultant (Geriatric Psychiatrist) and Clinician Scientist at Singapore General Hospital, specializing in the care of older patients with memory and mental health issues. He co-leads the Ageing and Population Health Research Peak at Singapore General Hospital, and serves as an Associate Professor at Duke-NUS Medical School. He has an interest in public health research, particularly in ageing and brain health. His research integrates behavioral and data sciences to address complex healthcare issues, exemplified by his role as the Lead Principal Investigator of Project PENSIEVE – a nationally-funded initiative that developed a scalable AI tool (PENSIEVE-AI) to detect cognitive impairment across diverse literacy.

Beyond his clinical and research roles, A/Prof. Liew actively contributes to the academic community. He is a clinical examiner for the Royal College of Psychiatrists (UK), and serves as an editorial board member of reputable medical journals (e.g. BMC Medicine, BMC Geriatrics, Healthcare). He also provides professional consultation to pharmaceutical companies (e.g. Lundbeck, Eisai) on matters related to geriatric psychiatry. A/Prof. Liew is dedicated to advancing geriatric psychiatry and public health, with a continual focus on strategies that enhance the wellbeing of the ageing population.

• NUS Saw Swee Hock School of Public Health
• Senior Consultant (Geriatric Psychiatrist), Singapore General Hospital (Primary)
• Associate Professor, SingHealth Duke-NUS Medicine Academic Clinical Programme, Duke-NUS Medical School
• Associate Professor, Programme in Health Services and Systems Research, Duke-NUS Medical School

• Ageing & Brain Health
• Behavioral & Data Science

• Dementia
• Geriatric Mental Health

• Fellowship of the Royal College of Psychiatrists (FRCPsych), United Kingdom
• PhD in Public Health, National University of Singapore
• Specialist Accreditation (Psychiatry), Ministry of Health Singapore
• Membership of the Royal College of Psychiatrists (MRCPsych), United Kingdom
• Master of Medicine (Psychiatry), National University of Singapore
• Master of Clinical Investigation, National University of Singapore
• Graduate Diploma in Geriatric Medicine, National University of Singapore
• MBBS, University of Malaya

• HPHSR Clinician Scientist Award 2024
• National Medical Research Council Research Training Fellowship
• Ministry of Health Healthcare Research Scholarship
• SingHealth Publish! Award 2021

• Liew TM, Foo JYH, Yang H, et al. PENSIEVE-AI a brief cognitive test to detect cognitive impairment across diverse literacy. Nature Communications. 2025;16(1):2847.
• Liew TM. Distinct trajectories of subjective cognitive decline before diagnosis of neurocognitive disorders: Longitudinal modelling over 18 years. J Prev Alzheimers Dis. 2025 Mar 7:100123. doi: 10.1016/j.tjpad.2025.100123. Epub ahead of print.
• Ang LC, Malhotra R, Roy Chowdhury A, Liew TM. Pre- and post- COVID-19 trends related to dementia caregiving on Twitter. Sci Rep. 2025 Feb 12;15(1):5173.
• Liew TM, Ang LC. Examining the non-linear effects of education on Alzheimer’s and non-Alzheimer’s disease: Sex-stratified analysis of 17,671 older persons. Soc Sci Med. 2024 Apr 4;348:116845.
• Ang LC, Yap P, Tay SY, Koay WI, Liew TM. Examining the Validity and Utility of Montreal Cognitive Assessment Domain Scores for Early Neurocognitive Disorders. J Am Med Dir Assoc. 2023 Mar;24(3):314-320.e2. doi: 10.1016/j.jamda.2022.12.028. Epub 2023 Feb 6.
• Liew TM. Subjective cognitive decline, APOE e4 allele, and the risk of neurocognitive disorders: age- and sex-stratified cohort study. Aust N Z J Psychiatry. 2022 Dec;56(12):1664-1675.
• Liew TM. Neuropsychiatric symptoms in early stage of Alzheimer’s and non-Alzheimer’s dementia, and the risk of progression to severe dementia. Age Ageing. 2021 Sep 11;50(5):1709-1718.
• Liew TM, Tai BC, Wee SL, Koh GCH, Yap P. The Longitudinal Effects of Caregiver Grief in Dementia and the Modifying Effects of Social Services. J Am Geriatr Soc. 2020 Jul 23.
• Liew TM. Neuropsychiatric symptoms in cognitively normal older persons, and the association with Alzheimer’s and non-Alzheimer’s dementia. Alzheimers Res Ther. 2020;12(1):35.
• Liew TM, Lee CS. Reappraising the efficacy and acceptability of multicomponent interventions for caregiver depression in dementia: the utility of network meta-analysis. Gerontologist. 2019 Jul 16;59(4):e380-e392.

Click here to view his full publication list.