[7] President William Howard Taft nominated Doe to replace Richard E. Sloan as an associate justice of the Arizona Territorial Supreme Court on May 8, 1909.

He was assigned to the fourth district, covering Apache, Coconino, Mohave, Navajo, and Yavapai counties.

[11] His most influential opinion was in Shannon Copper Company v. Svendsen, 13 Arizona 111 (1910) which provided a precedent in matters dealing with corporations, contracts, and procedure.

[12] In Southern Pacific Railroad c. Svendsen, 13 Arizona 111 (1910), the plaintiff claimed and was awarded damages for being thrown off a moving freight train.

[13] In other matters, Doe dealt with a bail request for an individual undergoing deportation proceedings under the Chinese Exclusion Act in Jung Goon Jow v. United States, 13 Arizona 255 (1910).

The case eventually expanded to include the widow of former Chief Justice Webster Street who was in a similar position of attempting to collect unpaid legal fees.

[11] Politically, Doe was elected to represent Coconino County in Arizona's 1910 constitutional convention.

[12] His clients included the Arizona Central Bank, Babbitt Bros., the Saginaw & Manistee Lumber Company, and the Santa Fe Railroad.