FBI Supervisory Special Agent (2016-) FBI Special Agent (2015-16) CBI Special Agent (?-2013) U.S. Army Special Forces (Former),Kimball Cho is a former member of the CBI team, along with Teresa Lisbon, Patrick Jane, Wayne Rigsby and Grace Van Pelt. Although he is normally a very serious person who always follows cases "by the book" he also has a very dry sense of humor. He mainly acts as the interrogator, because he is very persuasive and an excellent listener. We hardly see his personal life in the first 3 seasons. Yet in season 4, he gets a longer storyline. He dealt with drug addiction and his girlfriend and CI, Summer. Cho joined the FBI after the death of Red John in season 6, and continues to work with Jane and Lisbon when they come to join the team in Texas.