Early Life and Umbrella Career
Albert was raised as part of "Project Wesker", an assembly of children from parents with above-average intellegence kidnapped by the Umbrella Corporation and given the surname Wesker. He showed particular promise out of the other children, which pleased Umbrella's founder, Ozwell E. Spencer. Spencer saw in Wesker the makings of what his children needed. Obviously not coincidentally, Albert would eventually go into the service of the same company that moulded him and become a close employee under the watchful eyes of his creator, Spencer, all the while unaware of the pharmaceutical president's true intentions and his own destiny to serve him.
Wesker joined the international pharmaceutical enterprise Umbrella at the age of 17 and began working as one of its researchers. In 1977, Wesker was assigned to the Management Training Facility under Doctor James Marcus. Wesker became friends with fellow trainee William Birkin, becoming colleagues and accomplices for years to come. Both Wesker and Birkin were regarded by Marcus as his best apprentices, and when the Training Facility was closed down on July 29, 1978, the two were personally transferred to the Arklay Research Facility (underneath Ozwell E. Spencer's estate) to continue their own Tyrant virus research (while Marcus continued to work on his own), becoming the facility's chief researchers.
http://residentevil.wikia.com/wiki/Albert_Wesker