Robert "Wes" Wheeler Jr., a 22-year FBI veteran with a background in counterterrorism, was named Tuesday to lead the agency's busy Chicago field office.Wheeler's appointment was announced by FBI Director Christopher Wray four months after the retirement of Emmerson Buie in August.Wheeler, 51, a onetime agent with the Georgia Bureau of Investigation, joined the FBI in 1999 and most recently served as a chief of staff in the Cyber, Criminal, Response, and Services Branch in Washington D.C., a news release from the FBI stated.