Simmons

Simmons was a the leading field researcher and technican in the employ of Henry van Statten.

Simmons tortured the Dalek (which van Statten had named the "Metaltron") while van Statten attempted to discover what it was. As a former ex-security chief, Simmons apparently enjoyed his job, and appeared to be cold-blooded and sadistic.

After the Dalek used Rose Tyler's DNA to regenerate itself, Simmons confronted the creature. He arrogantly mocked it, ignorant of the mortal danger he was in. He finally realised what he had truly been "working" with when the Dalek clamped its sucker onto his face, suffocating him and even crushing his skull.

Biography from the TARDIS Data Core article, licensed under CC-BY-SA