She opened her own law firm in Gwinnett in 2009, then served as a municipal court judge in Snellville and as a juvenile court judge for Gwinnett County.
Whitner joins a recent series of barrier-breaking officials in Gwinnett, Georgia’s most ethnically diverse county.
Last May, Ronda Colvin-Leary became the first person of color elected in any countywide Gwinnett election when she earned a seat on the local State Court bench.
In November, Ben Ku and Marlene Fosque won their elections to become the county's first Asian-American and African-American commissioners, respectively. Everton Blair Jr. became the county's first black school board member.
In January, Ramon Alvarado was sworn in as a judge for Gwinnett recorder's court, becoming the county's first Hispanic judge.
Gwinnett County will get at least one more new Superior Court judge in the coming months.
In March, the state legislature adopted a bill creating an 11th spot on the county's Superior Court bench, a move aimed at helping the court keep up with a growing caseload.
Kemp will also appoint that judge, who would start in January 2020 and be up for re-election in 2022.