He has been credited for reviving the art of modern penmanship and lettering single-handedly through his books and teachings - his handbook on the subject, Writing & Illuminating, & Lettering (1906) was particularly influential on a generation of British typographers and calligraphers, including Graily Hewitt, Stanley Morison, Eric Gill, Alfred Fairbank and Anna Simons. Johnston also devised the simply crafted round calligraphic handwriting style, written with a broad pen, known today as the Foundational hand, although Johnston never used the terms "Foundational" or "Foundational Hand".