Miller was chief of staff at Warren County Hospital in Warren, OH, and an associate professor at Ohio University in Athens, OH, from 1976 to 1979, where he was named outstanding professor of the year in 1978. He served as chief of medicine at Pasco Medical Center in Dade City, FL, from 1980 to 1982 and as Salvation Army board president for two years. He has been a member of the NPR rotary club since 1979. He retired from family practice in 1998. He and his wife, Phyllis, reside in New Port Richey, FL.