Thomas Moore Johnson, the Sage of the Osage, was a small town lawyer in western Missouri whose international correspondence was largely a result of The Platonist, a short-lived but influential journal he published intermittently from 1881 until 1888. Johnson rarely traveled far from Osceola, his birthplace, where he served as mayor for several terms, but through correspondence he became a key figure in the late 19th century American awakening of interest in Western esoteric traditions.

During the 1880s Johnson was instrumental in the nationwide expansion of two esoteric organizations, the...