As a child, Plummer acted in short films such as
Frank (2010),
Three Things (2011), and
Alan Smithee (2012). In 2011, Plummer starred in eight episodes of
HBO's television
period drama Boardwalk Empire. He portrayed Eli Thompson's son Michael in
seasons 2,
3 and
4. In 2013, Plummer joined the
BYUtv's drama series
Granite Flats, in which he played the lead role of Timmy Sanders. He starred in all 24 episodes of three seasons, which premiered on
Netflix and ended in 2015. In 2015, he played the lead role of Jack in Felix Thompson's directorial debut
King Jack. The film premiered at the
Tribeca Film Festival. In 2017, Plummer co-starred in
Oren Moverman's drama thriller film
The Dinner. The film was released on May 5, 2017, and received mixed reviews. He played the kidnapped heir
John Paul Getty III in
Ridley Scott's crime thriller
All the Money in the World. The same year, Plummer portrayed the troubled teenager Charley who finds solace and purpose in his friendship with the titular racehorse in
Andrew Haigh's drama
Lean on Pete. The film premiered at the
Venice International Film Festival where his performance received critical acclaim; he was also awarded the
Marcello Mastroianni Award for best emerging actor. In 2018, Plummer starred in
Joshua Leonard's drama
Dark Was the Night. He also appeared in Duncan Skiles's suspense thriller
The Clovehitch Killer. In 2019, Plummer starred in
Nabil Elderkin's feature film debut
Gully. He also featured in Pippa Bianco's
Share, produced by
A24. In the same year, Plummer also had a leading role in Hulu's serial adaptation of
John Green's novel
Looking for Alaska, starring as 16-year-old Miles "Pudge" Halter. The series and Plummer's performance garnered critical acclaim. In 2020, Plummer starred in
Thor Freudenthal's drama
Words on Bathroom Walls, playing a young man diagnosed with
schizophrenia, and headlined the dark comedy
Spontaneous, directed by Brian Duffield and based on the novel of the same name by
Aaron Starmer. Both films received positive reviews. In 2022, Plummer starred in the
coming of age drama
Wildflower. The film received mixed reviews from critics. In 2023, he starred in
National Anthem as Dylan, directed by
Luke Gilford, which premiered at the 2023
SXSW Festival. The film was met with positive critical reviews, and his performance received critical acclaim. == Personal life ==