Plunkett was born on September 1, 1981 in Jacksonville, Texas. His father is a Presbyterian minister and his mother a special education Teacher.
In 2010, Plunkett was cast as the lead in Russell Harbaugh's short film Rolling on the Floor Laughing which was featured at the 2012 Sundance Film Festival.
In 2011, Plunkett made his Broadway debut in War Horse at the Vivian Beaumont Theater at Lincoln Center for the Performing Arts
In 2013, Plunkett was cast alongside Josh Lucas and Mickey Sumner in The Mend, which premiered at South By Southwest in March 2014.
