The person behind the biological disaster in Amparo, and who has at least some involvement in every T-Virus related scheme to date. After being nominated to manage the Umbrella Management Training Facility in the 1970s, he was one of the foremost researchers, active on Umbrella’s viral research programs.
It was right around the time his colleague, Dr. William Birkin’s research on the T-Virus was nearing completion that Wesker transferred to the company’s intelligence division. Wesker became the team leader of S.T.A.R.S., but that was only to conceal his true intentions.
He used the disaster at Arklay to his own advantage. After guiding his subordinates to the mansion, he secretly went off to collect data on the nearly perfected B.O.W.s that had been developed there.
His true intentions were discovered by Chris Redfield and a few other surviving S.T.A.R.S. members. It was thought that Wesker was killed by the Tyrant, but before he died, he injected himself with the T-Virus.
After collecting as much information as he could, and escaping the mansion he went to work for one of Umbrella’s rival companies, bringing with him all the live battle data he had collected.
That same year, right before the biological disaster and subsequent bombing of Raccoon City, he received help from the spy Ada Wong in acquiring a sample of the G-Virus developed by Dr. Birkin.
Several months later, he attacked the Ashford family administered Rockfort Island and the Antarctic base in search of the T-Veronica virus that had been developed by Alexia Ashford. He made off with the body of Steve Burnside, which was harboring T-Veronica.
And as a new millennium began he turned his interest to South America… Wesker comes into contact with a man frantically searching for a treatment for his daughter, the drug lord, Javier Hidalgo. He sold T-Veronica to Javier as an analeptic drug for a large sum of money and a stake in a collusive business partnership.
What Wesker’s motives were for putting T-Veronica, whose effects would ripple throughout the entire continent, in the hands of Javier, no one knows.
