Kendrick was the head doctor at Cedar Mill Psychiatric Hospital. He felt that his work on the psychopathic mind was very important. He had no family, preferring to work instead. He created a portable fMRI (functional magnetic resonance imaging-scanner) that allows him insight into how the brains of psychopaths work.
Through his story to Ferris, we learn that his father and grandfather both worked at the hospital (as a counselor and groundskeeper respectively). Kendrick virtually grew up in the halls of the hospital.
He is killed by Francis Ackerman Jr. when the killer dresses him up in his stolen guard uniform and pushes him from a closet, prompting David McNamara to shoot and kill Kendrick in a case of mistaken identity.
He seems to have a somewhat strained relationship with David McNamara, but overall the two men get along.