Dr Shamsul became a member of the Universiti Malaya faculty in 2017, where he works as an academic lecturer in the Department of Pharmacology within the Faculty of Medicine. Before that, during his two years as a postdoctoral fellow, he focused on molecular studies related to liver diseases, including drug-induced liver injury and non-alcoholic fatty liver disease. He holds multiple roles within the department, including Head of the Pharmacogenomics Laboratory, Quality Manager, Year-2 and Postgraduates Pharmacology Course Coordinator for dental programme, and Academic Advisor for postgraduate students. Additionally, he is a member of the faculty's Postgraduates Committee (JKITF) and Internationalisation Unit (IUFOM). Also, he holds the position of a contributing Associate Editor for the Malaysian Applied Biology Journal. He is an external examiner of a Pharmacy course programme for Kolej Universiti Antarabangsa MAIWP (UCMI). He is also the Chair and founder of the Malaysia-Taiwan Forum for Evidenced-Based Medicine, and maintains an active role as an associate member of the South East Asian Pharmacogenomics Network (SEAPharm). He is currently overseeing the progress of three PhD candidates and has successfully graduated three PhD and four master's degree graduates. He has a strong focus on clinical and molecular hepatology, pharmacogenomics, and other omics-related research, with an impressive track record of over 40 publications.