Accountant Vaughn Manufacturing Company, Chicago, 1970-1972, Stewart-Warner Corporation, Chicago, 1972-1973. Finance consultant Center Accounting Association, New Baden, 1977-1979. Auditor Illinois Department Mental Health, Springfield, 1980-1982, Chief Financial Officer, 1983-1997.
Chief bureau general accounting Illinois Department Human Services, 1997—2002. Board directors Metro City Bank, Doraville, Georgia.
Treasurer Korean Association Greater St. Louis, 1982. Member of Korean-American Association St. Louis (president since 2008), National Association Certified Valuation Analysts, Association Government Accountants (certified government finance manager), Illinois Certified Public Accountant Society, Korean-American Chamber of Commerce (vice president Greater St. Louis chapter 1994-1995).