As county Superintendent of Schools, Miller urged his teachers to promote clubs and teach farm subjects. He organized a train trip attended by 1400 people to Iowa State College in Ames to learn about livestock and farm/home economics equipment. He was one of the first to organize youth exhibitions for boys and girls to demonstrate what they had learned in their clubs. Miller’ work fostered many of the teaching tools of today’ 4-H program. He was inclusive of both boys and girls, and engaged the experts of Iowa State College, helping students learn from land-grant college research.

Honors & Activities
- Inducted to Iowa 4-H Hall of Fame 2003
- North Dakota Agricultural College, Economics Department Head
- Executive Secretary of Northwest Farm Management Association (1926-1951) and National Polled Cattle Club
- Nationally recognized Chautauqua speaker
- Superintendent of Schools, Keokuk Co. (IA), 1903–1909
Cap organized first county-wide boys agricultural club and girls home culture club in Iowa, started a self-supporting county school education fair and involved Iowa State College professors in local educational programs