<human>:  Who was the first to propose the theory of Employee Engagement?
<bot>: That would be Frederick Herzberg. He proposed the theory in the 1960s. He was a psychologist who studied the factors that motivate people to work. He found that there are two main factors that motivate people to work: job satisfaction and job motivation. Job satisfaction is the feeling of being satisfied with your job, and job motivation is the feeling of wanting to do your job well.