Kerr

Dr. Kerr is the associate of Konoko's father, Dr. Hasegawa. They worked together on the Syndicate's payroll to develop the Daodan Chrysalis because no one else would fund their work to save the world from the BioCrisis. When the Syndicate turned out to have their own plans for their research and raided the lab, Hasegawa and Kerr were split up. Kerr fled with Hasegawa's three year-old daughter Mai to the TCTF, where Mai was implanted with a prototype Chrysalis and raised to become the TCTF agent code-named Konoko. In the course of the game, Konoko finds out that Kerr is her mother's brother. By this time, Dr. Kerr is working in a Science Prison, which is apparently the TCTF's way of keeping scientists under control while doing research useful to the agency.

Besides Shinatama, Kerr is the only trustworthy character that Konoko knows. This is illustrated by cutscenes starting with Chapter 1, where he argues with Griffin out of concern for Konoko's safety, and especially in Chapter 8, where he pleads with Griffin not to try to kill Konoko with Shinatama's self-destruct signal. Although Kerr is the one responsible for implanting the Chrysalis in her, Konoko realizes that he was made to do it by Griffin, and that her uncle does care for her. Kerr ends up giving his life to protect Konoko from a Mercury Bow shot in Chapter 12, shortly after telling her much of what she needs to know in the game's longest expositional scene.

Not much is revealed about Kerr's background in either the game's cutscenes and text or in the printed manual, but Rockstar's Flash-based site did have a bio for Kerr where it stated that he had not only worked for the Syndicate in the past but the WCG as well. Logically, his specialty appears to be genetic engineering, because the bio states that he works in "the TCTF genetic engineering development lab".