TC Callahan
Michael Ragosa
Jordan Alexander

Eoin Macken

TC Callahan

Eoin Macken plays Dr. TC Callahan on NBC's new medical drama "The Night Shift."

An Army doctor who has recently returned from Afghanistan and uses unorthodox methods to save lives, Callahan's brash style does not always sit well with the bosses, but he is a brilliant surgeon and a fearless advocate for his patients.

Macken is perhaps best known for his work on the BBC One series "Merlin," on which he played the laid-back but brave and honorable character of Gwaine.

On the big screen, Macken's acting credits include "Centurion," with Michael Fassbender, and Dominic West and Lee Cronin's "Through the Night," as well as Andrew Hull's "Siren" and Mike Figgis' "Suspension of Disbelief."

He previously appeared on Showtime's "The Tudors," the Irish series "Raw" and "Fair City," as well as the Masterpiece Theater's telefilm "Small Island."

A prolific filmmaker, Macken recently completed production on the feature "Cold," on which he served as writer and director in addition to starring opposite Jack Reynor and Tom Hopper.

Macken wrote and edited his debut feature, "Christian Blake," which played at the Mid Ulster Film Festival, the 2008 Galway Film Fleadh and was released in May 2009. In 2008, Macken directed, wrote, edited and acted in his second film, "Dreaming for You," which was selected for the Los Angeles Short Film Festival and for the 2009 Galway Film Fleadh.

In 2009, Macken directed an hour-long documentary on the Irish fashion industry, "The Fashion of Modeling," which screened on RTE 2 in May of that year.

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