, 1915 Miller commenced his career in law in 1922 in
Williamson, West Virginia, where he remained for two years. Following the death of Froe in 1932, he and Capehart continued their practice under the name of Capehart and Miller. From 1928 to 1936, Miller served as an assistant
prosecuting attorney for
McDowell County. He had been appointed to the position following a recommendation from county prosecuting attorney, Wilson Anderson. According to the
Charleston Daily Mail in 1932, Miller was believed to be the only African-American assistant prosecuting attorney in the state. In 1934, Miller campaigned for the Republican nomination for a seat on the McDowell County board of education, and in August of that year, he was elected as the Republican candidate for the board. In October 1934, Miller was named chairman of the McDowell County Colored Republican Organization advisory committee. He also served as a member of the Welch
city council from 1944 to 1948. Miller was a contributor to various periodicals to include
The Crisis and
Opportunity: A Journal of Negro Life. In his 1935 article, "The Negro and the 'Closed Shop'", Miller wrote about African-American
strikebreakers and the discrimination against African-American workers by
organized labor. In his 1936 article, "A Greater N.A.A.C.P.", Miller discussed the need for the
NAACP to play an expanded, centralized role in organizing and improving the lives of African-Americans. In March 1941, Miller was a guest speaker on the
CBS national radio program,
Wings Over Jordan, in commemoration of the 50th anniversary of the North Carolina A&T State College. By 1938, Miller was the president of the McDowell County branch of the NAACP, in which capacity, he and the county NAACP sought to retain the African-American
Civilian Conservation Corps camp in the county's Big Creek district. Miller also later served on the West Virginia Bar Association legal ethics committee for
West Virginia's 5th congressional district in 1947. Miller served as the assistant committee chairperson for arrangements for the
1948 Republican National Convention in Philadelphia. In addition, he was an alternate delegate representing the 5th congressional district at the
1952 Republican National Convention in Chicago. == United States attorney ==