Carmack has also appeared in films, including The Butterfly Effect 3: Revelations, Into the Blue 2: The Reef, Love Wrecked, Beauty & the Briefcase and Alpha and Omega.

As a young boy, he played baseball, basketball, and football at Magruder High School, however; his attentions turned to theater and he began working on three productions per year, on-stage and off, in addition to competing in numerous drama festivals.

The other catalogs and editorials that he has worked for include: Lord and Taylor, Macy's, Target, Who.A.U, Elle France, Nautica, Guess?, and Cosmogirl.

In 2006, Carmack starred in the film Lovewrecked with Amanda Bynes and Jonathan Bennett and honed his acting skills in the theaters of New York and London.

Carmack starred opposite Rosamund Pike and was directed by former Royal Shakespeare Company artistic director Adrian Noble.

In 2013, Carmack was cast in the ABC drama series Nashville as Scarlett and Gunnar's neighbor Will, a sexy and charming country singer and guitar player.