Albert Wesker
In "", flashbacks reveal that Dr. James Marcus, the original founder of the Umbrella Corporation, had a daughter who was dying of premature aging. Desperate to save her, Marcus developed the T-virus as a way to cure all diseases on Earth. After having had his creation taken away from him, Marcus' business partner Dr. Alexander Isaacs tried to convince Marcus to use the T-virus for military purposes. When he refused, Isaacs ordered Albert Wesker to kill Marcus.