After graduation, he joined the United States Navy, serving as a Surface Warfare Officer, and provided combat operations support in the Gulf War.

Following his active duty military service, he attended the Fredric G. Levin College of Law at the University of Florida, receiving his Juris Doctor in 1994.

In 2014, when incumbent State Representative Daniel Davis declined to seek a third term in the legislature, Renner ran to succeed him in the 15th District, which included parts of downtown Jacksonville in western Duval County.

[5] He was opposed by former St. Johns County Commissioner Ron Sanchez and Danielle Anderson in the Republican primary, and emphasized his support for economic development, education, veterans issues, and tourism, noting that the district needs to get its "fair share" of state appropriations.

Renner was endorsed by The Florida Times-Union, which praised his "detailed, diverse resume that makes jaws drop" and suggested that he would be a "sensible and pragmatic legislator,"[7] and by The St. Augustine Record, which noted that he "has proven commitment and leadership in his military career.