Dr Lee joined the Institute of Mental Health (IMH) in 1994. He is currently a Psychiatrist and Senior Consultant as well as the Clinical Director at the Office of Population Health at IMH. He held multiple administrative appointments at IMH over the years, including the Programme Director of National Addictions Management Service from 2017 to 2024; the Vice-Chairman Medical Board (Clinical) from 2012 to 2021; Head of the Emergency Services from 2015 to 2021; the Programme Director of Mobile Crisis Service from 2007 to 2021; the Chief of the Department of Community Psychiatry from 2004 to 2014 and the Programme Director of the Community Mental Health Team from 2007 to 2017. 

Dr Lee is an Adjunct Associate Professor at Lee Kong Chian School of Medicine, Nanyang Technological University and an Adjunct Assistant Professor at Yong Loo Lin School of Medicine, National University of Singapore. Dr Lee has been a fellow with the Academy of Medicine, Singapore (Psychiatry) since 2003. He was previously the Vice President of the College of Psychiatrists and the Chairman of the Section of Addiction Psychiatry from 2018 to 2022. He is a board member of the Singapore Red Cross (SRC) and the Chairman of the SRC Academy Advisory Panel. He was also a past President of the Singapore Psychiatric Association. Dr Lee is the Chairman of a Drug Rehabilitation Centre Review Committee since 2021. He is a Council member of the Singapore Medical Council since 2021. He was the Chairman of the Singapore Armed Forces Psychiatry Advisory Board till 2025. 

Dr Lee is currently the President of the Singapore Association for Mental Health and past President of the Silver Ribbon Singapore. He was also a board member of the National Council for Social Service from 2014 to 2020. Dr Lee has been appointed as a Justice of the Peace since 2018. Dr Lee has received multiple awards over the years, including the Institute of Mental Health (IMH) 30 years Long Service Award in 2024; Ministry of Health/National Healthcare Group Distinguished Senior Clinician Award in 2021; National Day Award Public Administration Award (Bronze) in 2019; Public Service Star Service Award in 2010 and the Healthcare Humanity Award in 2008. He was also a shortlisted candidate for President’s Volunteerism & Philanthropy Awards (PVPA) 2021. 

Dr Lee understands that the road to recovery for persons with mental health issues may not be obvious or appears to be slow at times. His advice to all is that some days may feel heavier than others, but once one has made it through tough moment in the past it is already a significant achievement.