He was an accomplished virologist notorious for his work with groups affiliated with the bio-weapons black market. Wesker ultimately chose to betray Umbrella, the evil company he worked for, and work with other groups to steal its research data, benefiting from a mutation brought on by a prototype virus that gave him superhuman powers. Due to the virus it gave him red cat eyes which he hides behind Black sunglasses, along with super strength, reflexes and speed.