Gearhart was born and raised in Atlanta, Georgia, and began acting at the age of seven, landing national commercials with Burger King, PBS, Pizza Hut and the Cartoon Network.
Gearhart appeared in the television movies The Brooke Ellison Story directed by Christopher Reeve and Warm Springs, playing the son of Franklin Delano Roosevelt.
The first of the films was Canvas,[1] in which he starred opposite Marcia Gay Harden and Joe Pantoliano.
Gearhart portrayed Naomi Watts' and Tim Roth's son in Michael Haneke's Funny Games,[2][3] which premiered at the 2008 Sundance Film Festival.
In addition to films, Gearhart has appeared in television shows, including Lost and Law & Order: SVU.