Arnold C. Otto was a member of the Wisconsin State Assembly.
[1] He would graduate from Kaukauna High School in Kaukauna, Wisconsin, as well as from what was then Lawrence College and the George Washington University Law School.
Otto served as an officer in the District of Columbia National Guard and assisted in organizing the Legal Aid Society of Milwaukee.
On June 25, 1935, he married Madeline Bird.
Otto was elected to the Assembly in 1916 and 1918.