 The episode guest stars "Office" consulting producer Larry Wilmore as Mr. Brown.In this episode, Michael's (Steve Carell) controversial imitation of a Chris Rock routine forces the staff to undergo a racial diversity seminar.A consultant (Larry Wilmore) arrives to teach the staff about tolerance and diversity, but Michael insists on imparting his own knowledge—aggravating both the consultant and the entire office staff—and creates his own diversity seminar.