Born in Birmingham, Martin Aitchinson attended the Birmingham School of Art and then Slade School of Art. After his studies, he became a technical illustrator during the war. He then pursued a career as a freelance illustrator in the advertising field, as well as illustrating children's books and magazines. He was an illustrator for the Eagle comic from 1952 to 1963, and then one the main illustrators for Ladybird Books from 1963 to 1990.
Aitchison started working for Eagle magazine with the story 'Luck of the Legion'. Appearing in the series were characters such as Corporal Trenet and Legionnaire Bimberg, who became one of Eagle's finest comic creations. When a new editorial team took over, 'Luck of the Legion' was cancelled, and Aitchison took on the James Bond-like 'Danger Unlimited'. Afterwards, he drew comic adaptations of Conan Doyle's 'The Lost World' and the 'Hornblower Stories' of C.S. Forester.