Harker attended Hillcrest High School in Simpsonville, South Carolina.
[3] On July 9, 2014, Harker was named the pitching coach of the Furman Paladins baseball team.
[5] Furman University announced on May 18, 2020 that the Paladins baseball team would be terminated due to budget concerns during the COVID-19 pandemic.
[6] In February 2021, Harker was named the pitching coach at his alma mater Hillcrest high school.
Harker was named the head baseball coach at Limestone University August 3, 2021.