Alexander will be joined in the booth by returning analysts Kyle Petty and Wally Dallenbach. Alexander will debut during TNT's exclusive coverage of Cup Series racing from Pocono, Pa. on June 6.

In addition, Alexander will contribute to NASCAR.COM.

In a new role, TNT announcer Lindsay Czarniak will become the host for Countdown to Green, 60 minutes of pre-race coverage that leads into TNT's green-flag racing coverage.

In addition, she will host TNT and NASCAR.COM's post-race coverage, as well as give mid-race updates and reports. Czarniak will be joined by analysts Larry McReynolds and Petty.

"Adam's knowledge of the sport and his smooth delivery make him an excellent addition, and we're confident that he will bring out the best in Wally and Kyle in the broadcast booth," said Jeff Behnke, senior vice president and executive producer for Turner Sports. "Adam has a terrific reputation within NASCAR, and we have appreciated his work for a long time."

Behnke said TNT also is pleased to welcome Czarniak to pre-race coverage. "Lindsay's experience as veteran studio host, along with the enthusiasm, energy and knowledge she has cultivated as a pit reporter for the past three years on TNT, make her ideal to serve as TNT's studio host," Behnke said.

Beyond Alexander's TNT duties during six weeks of Summer Series coverage, Alexander also works for SPEED as a reporter for the network's racing coverage. He also has worked as a play-by-play announcer on the Motor Racing Network (MRN) and as a pit reporter for its Cup and Nationwide series coverage. Alexander began his career as an announcer for the Tri-State Speedway in Evansville, Ind.

In addition to Czarniak's tenure as a TNT announcer, she also serves as the full-time sports anchor at NBC's WRC-TV in Washington, D.C. Prior to that, Czarniak was co-host with George Michael on the syndicated Sports Machine with George Michael. In 2008, Czarniak was a studio host for NBC's Olympic Summer Games in Beijing, China, and in 2006, she was a sports desk reporter for the network's Olympic Winter Games in Turin, Italy. She appeared on various NBC-owned networks.

TNT's NASCAR telecasts will return with popular production features and enhancements, including TNT RaceBuddy, the award-winning multi-platform experience that provides companion coverage on NASCAR.COM with integrated content, unique camera angles and social media capabilities.

In addition, the acclaimed Pride of NASCAR series will continue as TNT profiles six legends, highlighting the sport's history and history makers. Finally, TNT's innovative Wide Open Coverage will air for the fourth year at Daytona.

Also returning to TNT this summer will be pit reporters Ralph Sheheen, Marty Snider and Matt Yocum.

This marks TNT's 27th consecutive year of televising the Cup Series, making it NASCAR's longest-running broadcast partner.