Pf. Dong Wan Seo is a specialist on pancreatico-biliary endoscopy and EUS. 

His current position is a full professor and Chairman of Department of Internal Medicine, University of Ulsan Medical College, Asan Medical Center which is the largest teaching hospital in South Korea.

He has created a lot of advanced endoscopy works to the World of GI Endoscopy including his own classification of cholangioscopic reading, EUS-guided treatment of pancreatic cystic tumors and EUS-guided ablation therapy of pancreatic solid tumor. He is actively conducting many studies related to interventional EUS. 

Prof. Seo served as Secretary General of World Endoscopy Organization (WEO) from 2013 to 2017, and Chairman of Steering Committee of World Congress of Endoscopy 2020 (ENDO 2020). Now he is serving as treasurer of WEO. He also served as Chairman of Educational Committee in Korean Society of Gastroenterology (KSG), Director of Gastroenterology Specialty Board in Korean Society of Internal Medicine (KSIM), and Secretary General of Society of Gastrointestinal Intervention (SGI). Pf. Seo started WEO International School of EUS (WISE) from 2018 to educate young endosonographers.