Iain De Caestecker is a Scottish actor best known for his starring role as Leo Fitz, an agent of S.H.I.E.L.D. who specialises in engineering, especially weapons technology, in the superhero science fiction comedy-drama television series Marvel's of S.H.I.E.L.D.
De Caestecker played the male lead in two high-profile BBC series: the BAFTA-winning Best Drama Series The Fades as well as Young James Herriot, for which he was nominated for a BAFTA Scotland Award for Best Actor/Actress – Television.
His thriller film In Fear, which he plays the co-lead opposite Alice Englert, premiered at the 2013 Sundance Film Festival. He can be seen in the feature film Filth with James McAvoy and Jim Broadbent.
Upon his first trip to Los Angeles, De Caestecker landed a series regular role on Marvel's Agents of S.H.I.E.L.D.
After a comprehensive search, he was cast in the lead role of Ryan Gosling's feature directorial debut How to Catch a Monster with a cast including Saoirse Ronan, Christina Hendricks and Ben Mendelsohn.