The administrator of a Dinaali hospital that rationed treatment by social value, who bought the Doctor's stolen program to staff its wards.
Chellick runs an overcrowded hospital in Critical Care, where medicine is allocated by a computer according to each patient's Treatment Coefficient, a measure of social value rather than medical need. He buys the Doctor's stolen mobile emitter and puts the Doctor to work on the poorly equipped lower level.
When the Doctor smuggles medicine to patients, Chellick confines him to the upper level. After the patient Tebbis dies, the Doctor infects Chellick with the same illness, and the Allocator gives him the same low rating. Faced with his own system, Chellick agrees to treat the lower-level patients.