Jack Miller completed his undergraduate education with a bachelor's degree from Creighton University and a master's degree from the Catholic University of America. He served in the United States Army Air Corps during World War II, achieving the rank of lieutenant colonel, and later earned a Juris Doctor from Columbia Law School. Miller's professional career includes roles as an attorney for the Internal Revenue Service and an assistant professor of law at Notre Dame Law School. He was elected to the Iowa House of Representatives, the Iowa Senate, and the United States Senate, where he served until his defeat in 1972. Following his legislative career, Miller was appointed to the United States Court of Customs and Patent Appeals and later to the United States Court of Appeals for the Federal Circuit.

Jack Miller's political career reveals a nuanced approach to civil rights, marked by progressive votes on landmark legislation, yet his absence in voting on the Civil Rights Act of 1968 hints at a complex stance on evolving civil rights issues. His judicial appointments and confirmations suggest a calculated alignment with civil rights advancements, but his silence on later legislation raises questions about his evolving ideology. Miller's rhetorical style likely balances a commitment to civil rights with a strategic consideration of regional and political dynamics.