Dunn was born on August 2, 1861, in
Douglas, Michigan, or in Saagetuck, Maine, the son of George E. Dunn and Ellen V. Dickinson. He attended
Allegan High School in
Allegan, Michigan, followed by a year of
preparatory school and then a year in the law department of the
University of Michigan. He was married to Nellie M. Briggs on January 3, 1883, in
Grand Rapids, Michigan. In 1885 he moved to Los Angeles, where he continued his law studies, and he was admitted to the
bar in 1887. ==Career==