 Between 1948 and 1950 he worked towards master's degree in physiology at Andrew Conway Ivy's Department of Clinical Science at the University of Illinois.There, under mentorship of professor Morton I. Grossman, he laid out foundations in gastrointestinal physiology and became known as Dr. Grossman's oldest living student.Since gastrin and cholecystokinin were already discovered by that time, Dr. Janowitz focused his study onto physiology of gastric organs and autonomic nervous system.