(Covers information from Anderson's universe)
The Business Man was a Japanese businessman.
In 2002, at the beginning of the Global T-Virus pandemic, the Business Man noticed the strange way J Pop Girl was acting before she transformed into an Undead. The Undead J Pop Girl attacked the Business Man and killed him, triggering the pandemic.
The Business Man was later cloned by the Umbrella Corporation for their continuing tests on the T-virus at their Umbrella Prime facility. After escaping into the Tokyo scenario, Alice witnessed a recreation of the Business Man's death through a clone which she soon after killed.