He enlisted in the United States Army in 1940, serving as a private in the 258th Field Artillery Regiment.

He then became a field examiner and hearing officer for the National Labor Relations Board for Northern California from 1948 to 1953.

Of note, Miller authored the legislation that established Point Reyes National Seashore.

He served in Congress from January 3, 1959, until his death in an airplane accident near Eureka, California, on October 7, 1962.

[1] This article incorporates public domain material from the Biographical Directory of the United States Congress