Orville was a member of the Wisconsin Legislature from 1899 to 1905.
Mosher was born near Waupun, Wisconsin. He graduated from Ripon College in 1879. He was the principal of the New Richmond High School from 1879 to 1883. After 1883 he engaged in milling and dealing in grain and farm produce. He was the president of the New Richmond School board for nine years. He was elected as a trustee for the St. Croix County Asylum for the Insane when it opened in 1896, and was relected to that position several times.