Cosmas Rinaldi A. Lesmana is a Senior Lecturer and Consultant in the Department of Internal Medicine, Hepatobiliary Division, Dr. Cipto Mangunkusumo National General Hospital, Universitas Indonesia in Jakarta. Dr Lesmana serves as one of the Research Coordinator Staff for the department. He is also work at Digestive Disease & GI Oncology Centre (DDOC), Medistra Hospital, Jakarta as well as at Liver-GI Centre, MRCCC Siloam Hospital, Jakarta as a senior consultant and interventional endoscopist. He carried out his medical and postgraduate training in Internal Medicine and also in Gastroenterology/Hepatology at Diponegoro University, Semarang and Department of Internal Medicine, Dr. Cipto Mangunkusumo National General Hospital, Universitas Indonesia, Jakarta. He underwent several additional short courses training in basic and advance endoscopy (ERCP) in Asian Institute of Gastroenterology (AIG), Hyderabad, India, and Hepatology (Fibroscan training) in Hopital Haut Leveaque, Bordeaux, France, and also basic molecular hepatitis virus at Victorian Infectious Disease Reference Laboratory (VIDRL), Melbourne, Australia. In 2011, he further continued his interest in portal hypertension training at Institute of Liver & Biliary Sciences (ILBS), New Delhi, India. In 2015, he underwent endoscopic ultrasound (EUS) training at Baldota Institute of Digestive Science (BIDS), Global Hospital, Mumbai, India. He has won several awards for his research, including being named 4th in the APASL Young Investigator Award in 2005, and 3rd in APASL 2010, the AASLD-APASL Award in 2008, Travel Grant Award from Society Gastrointestinal Intervention (SGI) Korea in 2010, as well as two times awards in AASLD (2012 and 2018). One of his research has been selected for presentation during Digestive Disease Week (DDW) meeting, 2017 in USA. Dr Lesmana is a member of several professional associations, including Past Executive Council Member of the Asian Pacific Association for the Study of the Liver (APASL), Fellow of American College of Physicians (FACP), Direct Fellow of American College of Gastroenterology (FACG) and Fellow of Indonesian Association of Internal Medicine (FINASIM). Currently, he is a member of Asian Endoscopic Ultrasound (EUS) Group (AEG). He has been involved as international EUS workshop instructor during AEG congress. He also has published many papers in peer-reviewed international journals and his interest includes hepatitis virus, liver cirrhosis, liver fibrosis, hepatocellular carcinoma, pancreato-biliary diseases, and diagnostic as well as therapeutic endoscopy, especially endoscopic ultrasound (EUS).