author
b. 1875
Best known for a practical little guide to letters and everyday writing, this early 20th-century author focused on helping ordinary people communicate clearly and confidently. His work has the straightforward, useful feel of a handbook meant to be kept close at hand.

by H. S. Coe, John N. (John Nathan) Martin
John N. Martin, also listed as John Nathan Martin, was born in 1875. He is associated with Business English and Correspondence, a practical writing guide that has remained accessible through public-domain and library records.
The surviving online record for Martin is fairly sparse, so not much personal background can be confirmed with confidence. What does come through clearly is his interest in clear, usable written communication—especially the kinds of letters and business messages people needed in everyday life.
That gives his work a lasting appeal: instead of aiming for literary showmanship, it seems designed to be helpful. Readers who enjoy older instructional books may appreciate him for exactly that plainspoken, serviceable approach.