Who is Timothy Noonan from Rainbow Six and what is their importance?

Timothy Noonan is an FBI Agent and member of Rainbow team. Noonan is a computer geek who comes up with new high-tech devices, cutting-edge communication equipment and video gear in assisting Rainbow in their fight against terrorists. Noonan surprises everyone when he turns out to be quite a sharpshooter himself and just at the moment when he needed to be.