His PhD The Company of Royal Adventurers Trading into Africa, was Published in the Journal of Negro History in 1919.

[3] He resigned the following year, effective July 1, 1934, to become head of the American Council on Education (ACE).

During his tenure, the organization's membership grew from 269 to 1,093 member groups and became an important voice in education policy.

[6] In 1946 President Harry Truman appointed Zook to chair a 28-member Presidential Commission on Higher Education that was given the charge of reexamining the U.S. system of higher education "in terms of its objectives, methods, and facilities; and in the light of the social role it has to play."

[7] George Zook was married to Susie Gant, a fellow student at Kansas.