Johan Gunnar Andersson
As assistant curator of the museum's Department of Vertebrate Paleontology, Granger was sufficiently free of administrative duties that for many years he could spend an average of five months a year in the field, mostly in the American West, as well as write two or three important papers each year. In 1921, he went to China and Mongolia as chief paleontologist of the museum's third expedition there. Under the direction of Johan Gunnar Andersson, Granger helped open and begin excavating the site at Zhoukoudian that yielded "Peking Man" ("Homo erectus pekinensis"). The initial discovery of a hominid tooth at Zhoukoudian was made in 1921 by another paleontologist, Otto Zdansky.