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Using the limited clinical tools available at the time, Plum developed guidelines to help determine how to best treat comatose patients, writing The Diagnosis of Stupor and Coma in 1966, together with his longtime research partner Dr. Jerome B. Posner, a work described by neurologist Marcus E. Raichle as having "put stupor and coma on the map as an important consideration in neurology".
One of Jones' most notable accomplishments was his self-published revision of the North American species of Astragalus.