Griffith began her career in the insurance industry by joining Progressive in 1988 as a claims representative in Indianapolis. After a number of managerial positions, she became the Chief Human Resources Officer in 2002 and also served as its Group President as of 2008. As Chief Human Resources Officer, Griffith launched Progressive’s first-ever diversity and inclusion program, establishing the Progressive African American Network and LGBT Plus in 2007. She later returned to claims in 2008, but this time serving as the group’s President.
She was later named President of Customer Operations and Chief Operating Officer of Progressive’s personal lines branch before her appointment as CEO of Progressive on July 1, 2016. She was the first female to hold this position in the insurance company's history.
The Progressive Corporation is one of the largest providers of car insurance in the United States. The company also insures motorcycles, boats, RVs and commercial vehicles, and provides home insurance through select companies. Progressive has expanded internationally as well, offering car insurance in Australia. The company was co-founded in 1937 by Jack Green and Joseph M. Lewis, and is headquartered in Mayfield Village, Ohio.