Considered one of Scotland's finest actors, Iain Glen grew up in Edinburgh, where he studied at the University of Aberdeen, escaping an unhappy childhood through acting. He eventually dropped out to study at the Royal Academy of Dramatic Arts in London, graduating in 1985 with fellow Masterpiece alum Ralph Fiennes (Page Eight) and winning the Gold Bancroft Medal. Over the past 25 years, Glen has taken on everything from low-budget independent films to major Hollywood blockbusters such as Tomb Raider and Resident Evil; from BBC costume dramas to a nude appearance opposite Nicole Kidman in The Blue Room and from popular British television series to stage roles in Shakespearean classics. Glen's Masterpiece credits include The Diary of Anne Frank, Kidnapped, Wives & Daughters, Painted Lady, The Wyvern Mystery, and Adam Bede. Glen is also known for his role as Ser Jorah Mormont in the television adaptation of George R.R. Martin's cult fantasy novel series The Game of Thrones.
Glen has relished working with Michelle Dockery (Mary), explaining, "It sounds like a paradox, but when the writing is very good, you become really dependent on the other actors to realize a scene. Michelle and I talked a lot about our screen relationship — I really value her opinion. She's a marvelous actress. You might think she is tailor-made for the role of Mary, but she isn't. She's just made it seem that way."