Milan was a scientist who worked with radiation sensitivity. This scientist's work suggested it was possible for Humans to adapt to high radiation environments.

In 2366, when considering how Humans would survive on Tau Cygna V, a planet bathed in hyperonic radiation, Doctor Beverly Crusher, who was familiar with Milan, presented the results of this scientist's research as an explanation. She, then, suggested the possiblity of the Tau Cygna Humans achieving this feat with extensive viral therapy. (TNG: "The Ensigns of Command")

This character was only mentioned in dialogue.