Oklahoma Secretary of Human Resources and Administration
List of Secretaries
Table:
#

Name

Took Office

Left Office

Governor served under

1

Oscar B. Jackson Jr.

2003

2011

Brad Henry

2011

2012

Mary Fallin

Observing the table information on 'Oklahoma Secretary of Human Resources and Administration' titled 'List of Secretaries', summarise the highlighted cells in a single sentence and format it within the following JSON object {"answer": "YOUR ANSWER"}.