Colossus: The World's Most Amazing Feats of Engineering

Colin Hynson worked in museum and heritage education, including the Science Museum in London, before becoming a children's and educational writer. He has written more than thirty nonfiction books for young people. He has also been a scriptwriter, appeared on radio and television, and written for the Guardian, the Times Educational Supplement, BBC History magazine, and various computing magazines.

Giulia Lombardo is a children's illustrator who studied entertainment design at the Nemo Academy of Digital Arts in Italy. She has illustrated many different subjects, but she especially loves to draw buildings, cities, and architecture. She works surrounded by cats, dogs, rabbits, and a chicken in her home in Florence, Italy.