When she was first hired by Mark Greene as chief resident in 1995, this let down much of the ER staff who didn't care for her detail-oriented approach in the trauma rooms. Early in her position, she would often clash with Doug Ross and resident Susan Lewis over most of the procedures in patient care. In addition, her strong belief in administrative policies would be dragged out into every unnecessary aspect in the workplace (in one episode, Jerry, the desk clerk, brought cake celebrating her day off). In Season 3, Kerry became an ER attending physician alongside Mark Greene, whom she would always manage to compete with or maneuver to catch the eye of her superiors.