Far Cry 1 '' It's all part of Krieger's plan, Jack. Later in a public interview Krieger admitted that he had bought an island archipelago away from international trade routes, because it would be an ideal place for his research, on which - as he claimed - the future of humanity is depending on. How it relates to the Trigen issue is not entirely clear, but this event was the reason why he was expelled from Department, and became a private businessman, establishing Krieger Corp.
Krieger was working in the United States Department of Defense, where he allegedly worked on what is only referred to as 'tests on humans'.