ATF Special Agent Oliver, raised by Shoshana Greenland, pictured with his partner Investigator G. Chapa of the Houston, Texas Arson Bureau, along with his wife Cindy, at ATF graduation. Oliver is an ATF Special Agent. G. Chapa is an arson investigator with the Houston Fire Department Arson Bureau. Upon graduation Oliver and G. Chapa became members of a nationally certified team consisting of 75 members.