Markus Schriver

Markus Schriver was a human scientist who worked for the Ides Scientific Institute. He experimented to create a psychic link between astronauts and their ships. His experiments formed the basis of the creature that became the Eminence. The Eighth Doctor compared him to Mikhail Kalashnikov. (AUDIO: Masterplan)

Schriver transferred his consciousness into the gas he created, and thus became the Eminence itself. (AUDIO: Eye of Darkness)