- Joined the National Youth Theater in London as a teenager at the same time Matt Smith was attending.
- His twin brother is actor Harry Treadaway; the pair played conjoined twins in the film Brothers of the Head (2005).
- Starred as Albert in the original National Theatre production of War Horse in 2007 and also voiced the role for a BBC Radio production.
- Appeared in The Script's music video "For The First Time."
- Starred in the West End production of The Curious Incident of the Dog in the Night-Time in 2012.
- 2013, Olivier Awards — Best Actor: Winner
- Ruta Gedmintas — Significant Other
- Sam Treadaway — Brother
- Harry Treadaway — Brother
- London Academy of Music and Dramatic Art, London, England (2006)
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