author
b. 1889
Best known for a practical 1917 manual on military instruction, this early 20th-century writer is a notably elusive figure in the historical record. The surviving evidence points to a career closely tied to Army training and instructional work.

by J. P. (James Perry) Cole, Oliver Schoonmaker
J. P. Cole, identified in library records as James Perry Cole and born in 1889, is credited as the co-author of Military Instructors Manual, published in 1917 with Oliver Schoonmaker. The book was issued by The Argus Company in Albany and cataloged by the Library of Congress as a handbook related to U.S. Army officers' instruction.
Public-domain and library sources consistently connect him with that work, and Project Gutenberg lists the same title as his available book. Beyond that, confirmed biographical detail is scarce, so it is safest to describe him as a little-documented early 20th-century author whose known legacy rests mainly on this substantial training manual.
Because reliable online sources provide very little personal background, details such as his education, wider career, or literary output are not well established from the material I could confirm here.