The Rainbow Tribe, Grayson's second movie, filmed in 2007, was based on a true story. The independent film won Best Picture in 2008, at The Feel Good Film Festival.
In 2010, Grayson appeared in the film adaption of Jeff Kinney's Diary of a Wimpy Kid. He played Fregley, an awkward and unpopular classmate of Greg Heffley. He reprised the role in the sequels, Diary of a Wimpy Kid: Rodrick Rules (2011) and Diary of a Wimpy Kid:Dog Days (2012). Grayson and his fellow cast mates twice received the "Best Performance in a Feature Film - Young Ensemble Cast" Award at the Young Artist Awards in 2011 and 2013, for their performances.
Grayson's television work includes guest appearances on Disney's "I'm In the Band", and a lead role in R.L. Stein's The Haunting Hour. In 2011, he completed his first voice-over role, as the voice of Marley, in "Marley and Me: The Puppy Years".
He has been a presenter at the DOVE Awards, done public service announcements and numerous commercials including McDonalds and Blue Cross/Blue Shield, and has been in the DVD series, "Bibleman".
In 2012, Grayson had the opportunity to work in his home state of Alabama, alongside Josh Lucas, Danny Glover, and Thomas Horn, in "Space Warriors". The feature film was released in theaters and to the Hallmark Channel in May 2013.
In his latest endeavor, Grayson plays an autistic baseball savant named Rafer, in the 2013 feature film, Season of Miracles, a role for which fans and critics have acknowledged his broader acting range.