He is best known for his performances in the NBC series, Rise, and John Magary's The Mend, which premiered at the 2014 South by Southwest Film Festival.

[1][2] Plunkett is also known for his performances in New York theater, which include roles in War Horse, The Orphans' Home Cycle, Gone Missing, This Beautiful City, On the Levee, London Wall, and Dada Woof Papa Hot.

His father is a Presbyterian minister and his mother a special education teacher.

In 2011, Plunkett made his Broadway debut in War Horse at the Vivian Beaumont Theater at Lincoln Center for the Performing Arts[9] In 2013, Plunkett was cast alongside Josh Lucas and Mickey Sumner in The Mend, which premiered at South By Southwest in March 2014.

[1][14][15][16] In 2017, Plunkett was cast as Robert Saunders in Rise on NBC.