Iain De Caestecker is a Scottish actor known for his work in television, film, and theater. His parents are both medial doctors.

His mother is Dr. Linda De Caestecker, Director of Public Health (DPH) for NHS Greater Glasgow and Clyde, as well as an honorary professor at Glasgow University.

Linda also worked with poor children in West Africa and many places of the United Kingdom. Iain has a twin sister named Nicky.

He and his sister grew up in Glasgow, where Iain attended Hillhead Primary School before graduating from Langslide College with a higher national diploma (HND) in Acting and Performance in 2010.

Iain De Caestecker made his professional acting debut at the age of nine in the BBC short film Billy and Zorba. Following that, he played a brief role as a bully in the comedic horror film The Little Vampire.

One of his notable roles is as Leo Fitz in the popular television series “Marvel’s Agents of S.H.I.E.L.D.” which aired from 2013 to 2020.  De Caestecker starred in BBC One’s three-part miniseries The Control Room in 2022.