Final answer:
This person's work spans across multiple subfields of psychology including clinical, cognitive, health, developmental, and forensic psychology.
Step-by-step explanation:
The work described here fits within several subfields of psychology, including clinical psychology, which focuses on the diagnosis and treatment of psychological disorders and problematic behavioral patterns. Another subfield is cognitive psychology, which investigates the relationship between thought processes and behaviors. The description also encompasses health psychology, which employs the biopsychosocial model to understand how biological, psychological, and sociocultural factors influence health. Additionally, specialties like developmental psychology and forensic psychology are relevant, with the former studying changes throughout the lifespan and the latter applying psychological principles within the legal system.