Joseph E. Johnson III was born in
Longdale, Virginia to mining and metallurgical engineer Joseph E. Johnson Jr. (himself a son of a director of the
Longdale Iron Co.) who managed various iron and steel plants before turning to consultancy work in New York, and Margaret Hill (Hilles) Johnson, alumna of
Bryn Mawr College, who married his father in 1902. He had an older brother with the same name who died in infancy in 1903, and his father was fatally run over by a car 48 years old in 1919. He grew up in
Scarsdale, New York. At
Harvard University, he earned his bachelor's, master's and doctoral degrees. Johnson joined the American Alpine Club in 1925, his climbing companions included
Henry S. Hall Jr. and
Sir Douglas Busk. He was a serious and devoted mountaineer climbing both in the Alps and the Canadian Rockies and his ascents include the first traverse of
Mount Edith Cavell, the
first ascents of
Oldhorn,
Erebus, Keystone and Casemate, but he gave up serious climbing after a long illness in the late 1920s. ==University career and US State Department==