"It's sheer perfection. My precious G-virus. No one will ever take you away from me."
William Birkin was an executive and chief scientist for the Umbrella Corporation. He was the developer responsible for the discovery of the G-virus and development of the G-Virus Project. He was also the husband of Annette Birkin and the father of Sherry Birkin. His involvement in the G-virus served as a catalyst for the events of the Raccoon City Destruction Incident. He's also one of the many master minds behind the Infection War.