- Served in the Tennessee House from 1998–2005, and Tennessee Senate from 2004- 2010. In the Senate, she served as Assistant Floor Leader and Tennessee Senate Caucus Chairman.
- Was elected in 2010 to the US House with 67% of the vote after winning a three-way primary for the Republican nomination.
- With over 40 years experience in health care including her work as a registered nurse, Diane is a leading voice on health care policy in Congress.
- Currently serves as Chair of the powerful House Budget Committee, the first woman to ever hold this position.