The person most likely to study the interaction of people, machines, and physical environments is a human factors psychologist (also known as an engineering psychologist). These psychologists focus on how people interact with machines and technology to improve performance, safety, and user experience in various settings, including everyday products and life-critical systems like airline controls and medical equipment

. Human factors psychology aims to make machines and environments compatible with human capabilities, optimizing design to reduce errors and enhance usability

. This field is distinct from industrial-organizational psychology, which focuses more broadly on workplace behavior and employee well-being, and from social psychology, which studies social interactions and influences

. In summary, a human factors psychologist specializes in studying and improving the interaction between humans, machines, and physical environments.