[3] Following law school, Doan established his practice in Pike County, Missouri despite having been admitted to the New York Bar.

[4] Moving to Yuma, Arizona Territory in January 1888, Doan spent the next few years working on irrigation projects.

[2] Doan joined the Arizona territorial bar in 1894 and was elected to a two-year term as Pinal County district attorney the same year.

[12] Decisions authored by Doan were appealed to the United States Supreme Court sixteen times.

Twelve of the decisions were upheld, three reversed, and in the case of Sherman and Penny v. Goodwin, 12 Arizona 42 (1908), the U.S. Supreme Court ruled that it lacked jurisdiction and dismissed the issue.