Final answer:
Elton Mayo was the researcher who conducted human relations management studies focused on the behavioral aspect of employee motivation at Western Electric's Hawthorne Works.
Step-by-step explanation:
The individual who performed human relations management research geared toward a behavioral scientific approach in regards to employee motivation was Elton Mayo. Mayo conducted his famous research at the Western Electric's Hawthorne Works, which was fundamental to the birth of organizational psychology. This research began with the study of physical work environment effects, such as lighting, but ultimately revealed the importance of psychological and social factors in the workplace.