He published several books on the subjects of biology and entomology, and helped to further the 1916 treaty between Canada and the United States for the protection of migratory birds.
Hewitt studied at the King Edward VI Grammar School in Macclesfield, and subsequently attended the University of Manchester from 1902 to 1909.
Hewitt helped draft the act, and established twelve field laboratories, which sought to investigate insect problems and outbreaks regionally through the central federal government.
[3] Hewitt was also very involved with the parks and forestry branches of the Department of the Interior, working closely with James Bernard Harkin on the subjects of bird sanctuaries, game preserves, and the general protection of wildlife.
[4] Hewitt was also instrumental in the negotiation of the Northwest Game Act of 1917, which set regulations for the hunting of birds and animals in the north of Canada.
[5] He published over 130 articles, monographs and reports on subjects ranging from conservation biology to the control of pest insects, compiled in the bibliography The Writings of the Late C. Gordon Hewitt After His Death by the entomological branch.