This was my first guess - a friend's father is an occupational psychologist. Here's a definition:

Occupational Psychology is concerned with the performance of people at work in training, how organisations function and how individuals and small groups behave at work. The aim is to increase the effectiveness of the organisation, and to improve the job satisfaction of the individual. The speciality is broader in scope and less formalised than most other areas of psychology, and it touches on the diverse fields including ergonomics, personnel management, and time management. Work can be in an advisory, teaching and research roles, and to a lesser extent, technical and administrative roles.

Occupational Psychologists often work for large companies (in both the private and public sectors), in government and public services, in management training centres and for private consultancies. They usually work alongside other professionals such as managers, trade union representatives, training offices and specialist staff from the firm or industry concerned.

From:http://www.bps.org.uk/careers/areas/occupational.cfm