He will appear alongside Daniel Brühl, Dakota Fanning, and Luke Evans. You'll probably remember David best from appearing in movies like 'Michael Collins', 'I Went Down', Intermission', 'King Arthur', 'Six Shooter' and 'The Guard'.
David was named Best Supporting Actor in Film and nominated Best New Talent for Intermission at the 2003 Irish Film and Television Awards.
The new show is a great chance for him in the US. It is being billed as an "unflinching psychological thriller set amidst the underbelly of New York City’s “Gilded Age,”
'The Alienis;t follows Laszlo Kreizler (Daniel Brühl, Inglourious Basterds, Rush, Captain America: Civil War), a brilliant and obsessive “Alienist” in the controversial new field of treating mental pathologies, who holds the key to hunting down a never-before-seen ritualistic killer murdering young boys.
“To play one of the most compelling characters I’ve ever read on the page has been a huge honour”, says Daniel Brühl.
“Caleb Carr devised a fascinating world of intrigue and complexity, and I look forward to international audiences seeing how our brilliant cast and creatives have brought his words to life.”
Based on the award-winning, fan-favourite novel by Caleb Carr, it has standout performances from Luke Evans (The Girl on the Train) and Dakota Fanning (American Pastoral).
“The response to the show in the US has been incredible and now I can’t wait for the rest of the world to watch it”, says Luke Evans.
The Alienist is a turn-of-the-century murder mystery: the story of the emergence of the world’s most powerful city that will stop at nothing to bury its darkest secrets.
In The Alienist, Luke Evans plays newspaper illustrator John Moore and Dakota Fanning plays Sara Howard, an ambitious secretary determined to become the city's first female police detective.
The series also stars Brian Geraghty (The Hurt Locker) as police commissioner Theodore Roosevelt, David Wilmot (Captain Connor), Douglas Smith (Miss Sloane) and Matthew Shear (Mistress America) as Marcus and Lucius Isaacson, twin brothers who help unravel the disturbing mystery; Matt Lintz (Pixels) as Stevie, a tough, young boy employed by Dr. Kreizler as a driver and errand boy; Robert Ray Wisdom (The Wire) as Cyrus, Kreizler's valet, a man with a dark past who has been reformed by Kreizler; and Q'orianka Kilcher (The New World) as Mary, Kreizler's mute maid with whom he shares a special unspoken connection.
“I am very proud of this show, and really excited that people will be able to watch it all at once”, adds Dakota Fanning.

Shot in Budapest, Hungary, The Alienist is a co-production of Paramount Television and Turner's Studio T. BAFTA-nominee Jakob Verbruggen (Black Mirror) serves as director and executive producer along with Academy Award® winner Eric Roth (Forrest Gump), Academy Award® nominees Hossein Amini (Drive) and E. Max Frye (Foxcatcher), Anonymous Content's Steve Golin and Rosalie Swedlin, along with Chris Symes and Emmy® winner Cary Fukunaga (True Detective). Serving as co-executive producers on the series are Marshall Persinger (Rectify) and Jamie Payne (The Driver)