M.D., Seoul National University, Seoul, South Korea, 1986.
M.S., Seoul National University, Seoul, South Korea, 1990.
M.B.A., University of Pennsylvania, Philadelphia, Pennsylvania, 1992.

Residency/Fellowship: Seoul National University, Seoul, South Korea (internal medicine), 1986-1990; University of Arkansas, Little Rock, Arkansas (internal medicine), 1992-1994; Mayo Clinic School of Graduate Medical Education, Rochester, Minnesota (gastroenterology), 1994-1997; (hepatology and liver transplantation), 1997-1998.

Certified by the American Board of Internal Medicine in Gastroenterology.

Mayo Clinic, Rochester, Minnesota, Consultant, Division of Gastroenterology and Hepatology, 1998-2013; Assistant Professor of Medicine, Mayo Clinic College of Medicine and Science, Rochester, Minnesota, 1999-2004; Associate Professor, 2004-2012; Professor, 2012-2013; Stanford University, Stanford, California, Chief, Division of Gastroenterology and Hepatology, 2013-2024; Professor of Medicine, Stanford University School of Medicine, Stanford, California, 2013-2024.

Appointed to the staff of Mayo Clinic in Arizona, 2024; Professor of Medicine, Mayo Clinic College of Medicine and Science, 2025-present.