Dr. Schenker in NOLF 1
A brilliant German scientist, Dr. Otto Schenker was the brains behind the human time bomb project. He later decides to defect from the Soviets which allows him to be kidnapped by HARM. He is later rescued by Cate Archer from the HARM North American facility. He then joins UNITY in stopping HARM and helps them mass produce the antidote for the time bombs. He then joins UNITY as their chief scientist and yet again helps them create a weapon that can destroy HARMs super soldiers.
Dr. Schenker in "No One Lives Forever 2"
Trivia
His wife had been killed in an explosion while conducting an experiment on the human time bomb serum.
He has a knack of losing his glasses and sometimes forgets to speak english instead of his native german.