O. O. (Olin Oglesby) Ellis

Born in Texas in 1886, Olin Oglesby Ellis appears in library and archival records as O. O. Ellis, the name under which his best-known works were published. He is most closely associated with The Plattsburg Manual, a handbook for military training that was issued in the 1910s and aimed at readers preparing for organized military instruction.

Ellis also appears as a contributor to The R. O. T. C. Manual, part of a set of textbooks for Reserve Officers' Training Corps instruction. Taken together, these books suggest a writer focused on clear, practical guidance rather than literary flourish, helping readers understand the routines and expectations of military training in a period when preparedness and officer education were receiving wide public attention.

Reliable biographical detail about his personal life is limited in the sources I could confirm during this search. Genealogical records identify him as Olin Oglesby Ellis (1886–1968), but the strongest documented picture of his career comes from the manuals and catalog records that preserve his work.