A native Scot, Alastair Duncan appeared in many British television series, including his breakout role as side-kick DS Peter Livingstone to Mark 's Mcmanus’s Taggart in Scottish television's eponymous detective series. Since moving to the US in 1994 he has guest starred in Mad Men, The Grinder, The Mentalist, Castle, Westworld and many more. His films include Tower of Terror, The Girl With the Dragon Tattoo, The Hound of the Baskervilles and Split Second
In the early 2000s, he started doing voiceover work, including playing Alfred Pennyworth in The Batman animated series and in the Batman Unlimited films and The Vulture/Adrian Toomes in Marvel’s Spider-Man. He has voiced video games like Warlords Battlecry, Legacy of Kain: Defiance, X-Men Legends II: Rise of Apocalypse, Tomb Raider: Legend, Tomb Raider: Anniversary, Final Fantasy XIV, Mass Effect, Infinity Blade II, Infinity Blade III, Metal Gear Rising: Revengeance, Middle-Earth: and the role for which he is best known, Celebrimbor in Shadow of Mordor and Shadow of War.