Kelly Stewart is from Johns Creek, Georgia. She has an associate's degree in psychology from Gainesville State College, a bachelor's degree in public administration from Brenau University, a master's degree in city planning from the Georgia Institute of Technology. She lives with her husband in Johns Creek.

Kelly is a human resources executive. She was director of human resources at Greater Atlanta Christian School, director of business and campus operations at First Baptist Church Atlanta, vice president of human resources at Lucas Group, and a human resources manager at EMS technologies. Earlier in her career, she served as county administrator for Fannin County and worked as a scheduler and legislative assistant in the United States House of Representatives.

Kelly is a former member of the Johns Creek City Council. She ran for the State of Georgia House of Representatives, District 50 in 2018 but did not win. She previously served as Mayor Pro Tempore for the City of Johns Creek.