[5] Warriner moved on to become Head of the English Department at Garden City High School on Long Island in 1937.
[6] His books described principles and techniques of writing, including copious examples, but they were not illustrated or meant to be engaging in terms of graphic design.
Levels of usage given are standard, colloquial, and illiterate, and recognition is given to the differences between spoken and written English.
"[9] Warriner himself once wrote: "Properly used, a textbook is an indispensable aid to the teacher who needs it for the abundance of teaching materials it contains and an important asset to the student who knows how to use it for reference.
Said another, also after his death, "Arguably, John Warriner's textbooks have influenced writing instruction more than any other series at either the secondary or college level".
[12] Warriner was called "the world's foremost authority on sentence diagramming" by the Detroit Free Press.