Dr. Young-Hyeh Ko is a professor of department of pathology, Samsung medical center, Sungkyunkwan university, Seoul, Korea. She is a member of International Lymphoma Study Group and pathology review panel for International T-cell project. Her main field of interest is EBV-associated lymphoproliferative disease and she has been joined as an author of the corresponding chapters of WHO blue book. Recently she has published several papers on genomic profile of malignant lymphomas.