Economic Cooperation Administration
According to William C. Sherman, in 1949 Miller was his deputy at the Performance Review Section of the Economic Cooperation Administration in Seoul. When the Korean War broke out in 1950, he was evacuated to Japan, returning in 1951. In 1953 Miller worked for South Korea's central bank, the Bank of Korea, until his retirement in the early 1980s. He became fluent in the Korean language and later worked as a financial advisor and broker with a number of South Korean financial firms, ending with Good Morning Securities.