Doctor Lewis Zimmerman was a noted 24th century Human scientist and holo-engineer, responsible for the creation and development of the Emergency Medical Hologram, or "EMH" and considered to be the father of modern holography. He was also the model for the image of the EMH Mark I, a fact that he found to be a great source of embarrassment when wide scale use of the Mark I was discontinued and the holograms later re utilized to perform menial tasks.