In 2007, appeared in stage productions of a Hugh Leonard adaptation of Charles Dickens' Great Expectations; and a revival of David Mamet's American Buffalo, which earned him a Best Supporting Actor nomination at the Irish Times Irish Theatre Awards.
Has written and directed several short films, including What Will Survive of Us (2009) and Noreen (2010); brother Brian was in both, and father, Brendan, was in the latter.
Named one of 2011's Shooting Stars at the Berlin International Film Festival.
Played Bill Weasley in Harry Potter and the Deathly Hollows: Part 1 (2010) and Part 2 (2011); father, Brendan, was also in Part 1 as Alastor Moody.
At Irish Film & Television Awards in 2011, won for Actor in a Lead Role, playing musician-activist Bob Geldof in the TV biopic When Harvey Met Bob (2010), as well as the Rising Star Award; and in 2013 won for Supporting Actor in Anna Karenina (2012).