Dr. Chih-Chiang Chen got his M.D. and Ph.D. degree from National Yang Ming University, Taiwan. After finishing his residence training from the Department of Dermatology, Taipei Veterans General Hospital, he applied to be a visiting scholar at the Department of Pathology, University of Southern California for proceeding his basic research. What he focuses is on how extra-niche macro-environment regulates the homeostasis of stem cells.