His journalistic career began in 1898 when he joined Sir Isaac Pitman and Son, moving from there to Cassells, and then to the Harmsworth Group (later to become the Amalgamated Press) and commencing his long association with Arthur Mee.
Tyerman was responsible for producing My Magazine and was Art Editor of The Children's Encyclopædia, a publication which he was later to revise and update.
Tyerman wrote much of the material for the publication and, upon the death of Arthur Mee in 1943, he became its editor.
[1] In 1940, Arthur Mee's county series The King's England was first published and Tyerman wrote the volume on Essex, which was the first to appear.
The series was incomplete when Arthur Mee died and Tyerman was responsible for completing the works on the remaining counties.