An Irish film actor, he gained recognition for his role as Brendan in the animated feature "The Secret of Kells" (2009). Known for his voice acting, he brought youthful energy and depth to the character, contributing to the film's critical acclaim and Oscar nomination. Despite his young age during the film's production, he delivered a compelling performance that resonated with audiences. McGuire has since maintained a low profile, with limited information available on subsequent projects.