Jacob Robert Kantor (1888-1984) was a prominent systematic psychologist who organized scientific values into a coherent system of psychology. From the interbehavioral perspective, self-actional causes, whether fictional events (e.g., mentalism) or fictional powers attributed to otherwise actual events (brain as cause of behavior), are anathema to the science of psychology. He is the author of a number of books on general logic, psychology, and the logic of science. He has also published numerous articles in scientific journals. Among his publications are The Logic of Modern Science, Psychology and Logic, and The Aim and Progress of Psychology and Other Sciences.