Daniel Clarke

Dr. Daniel Clarke is an English character in Call of Duty: Black Ops, appearing in Numbers which takes place in Kowloon with Weaver and Jason Hudson. Clarke can be seen with the player running through apartments and atop rooftops. The player and Clarke are later joined by Weaver, who assisted in the raid on the Soviet facility in Russia. Sometime after the reunion, the three reveal a secret weapons cache behind a fridge. Clarke is killed after revealing Friedrich Steiner created Nova Six by a Soviet Trooper and Hudson lets him go and falls to the street below.

Trivia

 * In the Tom Clancy novels, John Kelly, codenamed "Mr. Clark" by the CIA, was originally a Navy SEAL and part of SOG. He fought in Vietnam multiple times and before and after he left the navy. He was later recruited by the CIA and would become a legend as a remarkable field officer.
 * If one listens, Clark sounds remarkably like Reznov, but with an English accent, so it is possible they are both voiced by Gary Oldman, who is English himself.