Averill Abraham Liebow (March 31, 1911 - May 31, 1978) was an international leader on the pathology of the lung.[1][2] He is credited with the development of a classification system for lung disease.[2] His observations resulted in the discovery of new diseases.[1] Liebow was among the first scientists to enter Hiroshima, Japan, after the atomic bomb was dropped in 1945. Accounts of that experience were published in "Encounter With Disaster: A Medical Diary of Hiroshima" and "Medical Effects of the Atomic Bomb in Japan."[2]