If you want to know more about business psychology and business psychologists, try these two sites:
The Association of Business Psychologists (ABP) is the’ trade’ group for business psychologists in the UK, whereas the British Psychological Society (BPS) Division of Occupational Psychology is the professional body.
In the US, Business or Occupational Psychologists are often called Industrial/Organizational (IO) Psychologists. You can find more information on the Society for Industrial & Organizational Psychology website:
Finally if it’s human factors and ergonomics that you want to learn about, start here: